Solid synonym


The definition of trustworthy is someone who is honest who can be entrusted with your secrets or with anything else of importance.


Unchanging in nature, value, or extent; invariable:


Relatively unchanging, permanent; firmly fixed or established; consistent; not easily moved, altered, or destroyed.


Firmly, often dogmatically held:


Lacking in shade; undiminished:


Having all sides or faces equal. For example, a square is a regular polygon, and a cube is a regular polyhedron.


The definition of firm is solid, hard or rigid.


Upright in character and behavior; honorable


of the same color throughout


Continuous, without interruption.


Being at the peak of development or maturity:


Financially secure or safe:


Suitable or proper in nature; fitting:


Unyielding to pressure or force


Not easily moved or shaken



Based on good judgment, reasoning, or evidence


Managing for an owner; acting as trustee


Being in or characterized by complete agreement


Expressed in units measuring area:

solid state

the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape


(Computing, said of an operating system's kernel) consisting of a single program using a single memory-addressing space


Lacking or appearing to lack substance or reality:


Smooth and flowing; graceful:


Having or showing no doubt; positive; confident


Fitting close or too close to the skin; snug:


Liable to be required to give account, as of one's actions or of the discharge of a duty or trust:


Relating to or resembling vapor:


(Figuratively, usually with "in") Having a basic or fundamental connection (to a thing); based, originating (from).


Not changing, fickle, or wavering; constant


Relatively great in extent from one surface to the opposite, usually in the smallest solid dimension; not thin:


Following one after another without interruption; successive:


The definition of consistent is something that is reliable or in agreement.


Serving to convince; persuasive or believable:


(Mathematics) Of the third power, order, or degree.


(Mathematics, topology) Being a subset of a topological space that approximates the space well. See dense sets for mathematical definition.


solid synonym | English Thesaurus




1  compact, concrete, dense, firm, hard, massed, stable, strong, sturdy, substantial, unshakable  

2  genuine, good, pure, real, reliable, sound  

3  agreed, complete, continuous, unalloyed, unanimous, unbroken, undivided, uninterrupted, united, unmixed  

4  constant, decent, dependable, estimable, law-abiding, level-headed, reliable, sensible, serious, sober, trusty, upright, upstanding, worthy  

1  broken, crumbling, decaying, flimsy, gaseous, hollow, liquid, permeable, precarious, shaky, unstable, unsteady, unsubstantial  

2  impure, unreliable, unsound  

3  at odds, divided, mixed, split, undecided  

4  flighty, irresponsible, unreliable, unsound, unstable, unsteady  



    (solids  plural  )

1    adj  A solid substance or object stays the same shape whether it is in a container or not.  
usu ADJ n    (Antonym: liquid)   ...the potential of greatly reducing our solid waste problem..., He did not eat solid food for several weeks.    

2    n-count  A solid is a substance that stays the same shape whether it is in a container or not.,  (Antonym: liquid)   Solids turn to liquids at certain temperatures., ...the decomposition of solids.    

3    adj  A substance that is solid is very hard or firm.  
The snow had melted, but the lake was still frozen solid..., The concrete will stay as solid as a rock.    

4    adj  A solid object or mass does not have a space inside it, or holes or gaps in it.  
usu ADJ n  
...a tunnel carved through 50ft of solid rock., ...a solid mass of colour..., The car park was absolutely packed solid with people.    

5    adj  If an object is made of solid gold or solid wood, for example, it is made of gold or wood all the way through, rather than just on the outside.  
ADJ n  
...solid wood doors., ...solid pine furniture.    

6    adj  A structure that is solid is strong and is not likely to collapse or fall over.  
Banks are built to look solid to reassure their customers..., The car feels very solid.    
  solidly    adv  ADV with v  
Their house, which was solidly built, resisted the main shock.    
  solidity    n-uncount  
...the solidity of walls and floors.    

7    adj  If you describe someone as solid, you mean that they are very reliable and respectable.,  (approval)   Mr Zuma had a solid reputation as a grass roots organiser.    
  solidly    adv  
Graham is so solidly consistent.    
  solidity    n-uncount  
He had the proverbial solidity of the English.    

8    adj  Solid evidence or information is reliable because it is based on facts.  
We don't have good solid information on where the people are..., He has a solid alibi.    

9    adj  You use solid to describe something such as advice or a piece of work which is useful and reliable.  
The CIU provides churches with solid advice on a wide range of subjects..., All I am looking for is a good solid performance...    
  solidly    adv  ADV with v  
She's played solidly throughout the spring.    

10    adj  You use solid to describe something such as the basis for a policy or support for an organization when it is strong, because it has been developed carefully and slowly.   (=strong)  
...Washington's attempt to build a solid international coalition.    
  solidly    adv  ADV adj/prep, ADV with v  
The Los Alamos district is solidly Republican..., So far, majority public opinion is solidly behind the government.    
  solidity    n-uncount  
...doubts over the solidity of European backing for the American approach.    

11    adj  If you do something for a solid period of time, you do it without any pause or interruption throughout that time.  
ADJ n, -ed ADJ  
We had worked together for two solid years.    
  solidly    adv  ADV with v  
People who had worked solidly since Christmas enjoyed the chance of a Friday off.    

  →   rock-solid  

rock-solid  , rock solid  

1    adj  Something that is rock-solid is extremely hard.  
Freeze it only until firm but not rock solid.    

2    adj  If you describe someone or something as rock-solid, you approve of them because they are extremely reliable or unlikely to change.,  (approval)   Mayhew is a man of rock-solid integrity...    

solid fuel      (solid fuels  plural  )Solid fuel is fuel such as coal or wood, that is solid rather than liquid or gas.  
  (BRIT)    n-mass  

Solid-state electronic equipment is made using transistors or silicon chips, instead of valves or other mechanical parts.    (TECHNICAL)    adj  ADJ n  

  • SSD  n. solid state drive

    A solid-state drive (SSD) is believed to be a data storage device that uses solid-state memory to store persistent data.

  • skerrick  n. small unmeasured amount usually applied to a solid

    used widely in Australia


Alphabetical index

Welcome to English-Thesaurus Collins dictionary ("Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995").

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Synonyms of solid in English:


See US English definition of solid

See UK English definition of solid

See Spanish definition of sólido


1‘the stream was frozen solid’


hard, rock-hard, rigid, firm, solidified, set, frozen, jellied, congealed, concrete

2‘a pendant made of solid gold’


pure, 24-carat, unalloyed, unmixed, unadulterated, genuine, complete


alloyed, plated, hollow

3‘a solid line of people’


continuous, uninterrupted, unbroken, non-stop, unremitting, incessant, constant, consecutive, undivided

4‘good solid houses’


well built, well constructed, sound, substantial, strong, sturdy, stout, durable, stable

5‘a solid argument’


well founded, well grounded, valid, sound, reasonable, logical, weighty, authoritative, convincing, cogent, plausible, credible, reliable


untenable, incoherent

6‘a solid friendship’


dependable, reliable, firm, unshakeable, trustworthy, stable, steadfast, unfailing, staunch, constant, unwavering

7‘the family have established themselves in this country as solid citizens’


sensible, level-headed, dependable, trustworthy, down-to-earth, decent, law-abiding, upright, upstanding, worthy

8‘the company is very solid and will come through the current recession’


financially sound, secure, creditworthy, of good financial standing, in funds, profit-making, able to pay its debts, debt-free, solvent, in credit, not in debt, out of debt, in the black

Financeungeared, unlevered

rare unindebted

9‘they received solid support from their colleagues’


unanimous, united, uniform, consistent, undivided

of one mind, of the same mind, in unison

rare consentient



This shows grade level based on the word's complexity.


having three dimensions (length, breadth, and thickness), as a geometrical body or figure.

of or relating to bodies or figures of three dimensions.

having the interior completely filled up, free from cavities, or not hollow: a solid piece of chocolate.

without openings or breaks: a solid wall.

firm, hard, or compact in substance: solid ground.

having relative firmness, coherence of particles, or persistence of form, as matter that is not liquid or gaseous: solid particles suspended in a liquid.

pertaining to such matter: Water in a solid state is ice.

dense, thick, or heavy in nature or appearance: solid masses of cloud.

not flimsy, slight, or light, as buildings, furniture, fabrics, or food; substantial.

of a substantial character; not superficial, trifling, or frivolous: a solid work of scientific scholarship.

without separation or division; continuous: a solid row of buildings.

whole or entire: one solid hour.

forming the whole; consisting entirely of one substance or material: solid gold.

uniform in tone or shades, as a color: a solid blue dress.

real or genuine: solid comfort.

sound or reliable, as reasons or arguments: solid facts.

sober-minded; fully reliable or sensible: a solid citizen.

financially sound or strong: Our company is solid.

cubic: A solid foot contains 1,728 solid inches.

written without a hyphen, as a compound word.

having the lines not separated by leads, or having few open spaces, as type or printing.

thorough, vigorous, great, big, etc. (with emphatic force, often after good): a good solid blow.

firmly united or consolidated: a solid combination.

united or unanimous in opinion, policy, etc.

on a friendly, favorable, or advantageous footing (often preceded by in): He was in solid with her parents.

Slang. excellent, especially musically.


a body or object having three dimensions (length, breadth, and thickness).

a solid substance or body; a substance exhibiting rigidity.



We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.

Question 1 of 8

Which of the following words describes “sky blue”?

Idioms about solid

    do (someone) a solid, Informal. to help out, be supportive, or do a favor for: Do him a solid and second his nomination.

Origin of solid

First recorded in 1350–1400; Middle English solide, from Old French solide, from Latin solidus “dense, compact”

synonym study for solid

5. See firm1.





solid , stolid

Words nearby solid

soliciting, solicitor, solicitor general, solicitous, solicitude, solid, solidago, solid angle, solidarity, solidarize, solidary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Words related to solid

sturdy, tight, strong, substantial, stable, steady, real, satisfactory, good, genuine, decent, satisfying, serious, sound, heavy, set, compact, material, hulk, firm

How to use solid in a sentence

  • The device, which Microsoft calls “the world’s most powerful console,” will support 4K graphics and feature a solid-state drive, allowing for faster loading times than previous video-game hardware.

    It’s official: The Xbox Series X will launch in November|radmarya|September 9, 2020|Fortune

  • “This will take a lot of solid negotiating,” says Mark Schneider of the International Crisis Group.

    Meet America’s Next Ambassador to Cuba|Eleanor Clift|December 18, 2014|DAILY BEAST

  • By nightfall, I had showered, eaten some soup that a friend brought me, and I slept in my room for 12 solid hours.

    I Was Gang Raped at a UVA Frat 30 Years Ago, and No One Did Anything|Liz Seccuro|December 16, 2014|DAILY BEAST

  • So there is nothing wrong with using the charms of, say, Parks and Recreation, to create some solid bonding time.

    Binge Watching is the New Bonding Time|The Daily Beast|December 10, 2014|DAILY BEAST

  • But I'm pretty solid in the knowing that he's disgusted by that.

    The Chris Brown vs. Drake Feud Continues: Brown Claims Ex GF Karrueche Tran Cheated with Drizzy|Marlow Stern|December 7, 2014|DAILY BEAST

  • Now, the Memphis congressman is one of only a handful of white Southerners in his caucus and the once Solid South is deep red.

    Southern Dems Won’t Rise Again|Ben Jacobs|December 5, 2014|DAILY BEAST

  • When it cleared, the valley was a solid expanse of white, and the stars shone out as if in an Arctic sky.

    Ramona|Helen Hunt Jackson

  • I hope the French Government will recognize this dashing stroke of d'Amade's by something more solid than a thank you.

    Gallipoli Diary, Volume I|Ian Hamilton

  • But it was neither his talents as a diplomatist, nor his remarkable mind, nor his solid erudition, which made Nicot immortal.

    Tobacco; Its History, Varieties, Culture, Manufacture and Commerce|E. R. Billings.

  • Black Sheep was sent to the drawing-room and charged into a solid tea-table laden with china.

    Kipling Stories and Poems Every Child Should Know, Book II|Rudyard Kipling

  • In my house there has never been sufficient food for a solid meal, and I have not land enough even for an insect to rest upon.

    Our Little Korean Cousin|H. Lee M. Pike

British Dictionary definitions for solid


of, concerned with, or being a substance in a physical state in which it resists changes in size and shapeCompare liquid (def. 1), gas (def. 1)

consisting of matter all through

of the same substance all throughsolid rock

sound; proved or provablesolid facts

reliable or sensible; upstandinga solid citizen

firm, strong, compact, or substantiala solid table; solid ground

(of a meal or food) substantial

(often postpositive)without interruption or respite; continuoussolid bombardment

financially sound or solventa solid institution

strongly linked or consolidateda solid relationship

geometryhaving or relating to three dimensionsa solid figure; solid geometry

(of a word composed of two or more other words or elements) written or printed as a single word without a hyphen

printingwith no space or leads between lines of type

solid forunanimously in favour of

(of a writer, work, performance, etc) adequate; sensible

of or having a single uniform colour or tone

NZinformalexcessive; unreasonably strict


  1. a closed surface in three-dimensional space
  2. such a surface together with the volume enclosed by it

a solid substance, such as wood, iron, or diamond

(plural)solid food, as opposed to liquid

Derived forms of solid

solidity (səˈlɪdɪtɪ), nounsolidly, adverbsolidness, noun

Word Origin for solid

C14: from Old French solide, from Latin solidus firm; related to Latin sollus whole

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for solid


Of definite shape and volume; not liquid or gaseous.

Firm or compact in substance.

Having no internal cavity or hollow.


A solid substance, body, or tissue.

Food that is relatively firm in substance or that must be chewed before swallowing.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for solid

PhysicsOne of four main states of matter, in which the molecules vibrate about fixed positions and cannot migrate to other positions in the substance. Unlike a gas or liquid, a solid has a fixed shape, and unlike a gas, a solid has a fixed volume. In most solids (with exceptions such as glass), the molecules are arranged in crystal lattices of various sizes.

MathematicsA geometric figure that has three dimensions.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for solid

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


Synonym solid

We were in Zhigulevsk with friends. We had a great rest. On a grand scale. In our company were me, my wife, two of my acquaintances and some other guys whom we met on the ship. My wife is sociable, maintains a conversation, talks on any topic.

I would like to advise you, my dear, to start from the regimental composition of women. It's not for me to teach you, but these infections, the colonel lowered his eyes to her skirt, are precisely from them. And yet, I want to draw your attention to the new composition of women. For example, on the wife of Senior Lieutenant Kopalsky.

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