Synonyms of solid

solid

adjective

ˈsä-ləd 

1

as in logical

based on sound reasoning or information

the only solid conclusion that the jury could have reached

Synonyms & Similar Words

• logical
• reasonable
• good
• reasoned
• valid
• sensible
• rational
• hard
• true
• justified
• firm
• sober
• informed
• plausible
• well-founded
• commonsense
• just
• real
• credible
• levelheaded
• actual
• commonsensible
• commonsensical
• validated
• convincing
• certain
• substantiated
• sure
• certified
• cogent
• confirmed
• verified
• colorable
• corroborated

Antonyms & Near Antonyms

• unreasonable
• irrational
• illogical
• unsound
• unfounded
• unjustified
• invalid
• nonsensical
• uninformed
• weak
• groundless
• unsupported
• nonrational
• unwarranted
• unsubstantiated
• flimsy
• unreasoned
• unconvincing
• implausible
• nonvalid
• false
• misguided
• fallacious
• misled

2

as in hard

having a consistency that does not easily yield to pressure

the ice cream is too solid to scoop right now

Synonyms & Similar Words

• hard
• stiff
• compact
• thick
• rigid
• compressed
• heavy
• dense
• firm
• unyielding
• sturdy
• compacted
• hardened
• stiffened
• tempered
• condensed
• indurated
• substantial
• inelastic
• close
• thickset
• unbending
• inflexible
• adamantine
• case-hardened
• impenetrable
• rocklike
• impermeable
• nonporous
• ramrod

Antonyms & Near Antonyms

• soft
• thin
• loose
• spongy
• flabby
• flexible
• scattered
• elastic
• malleable
• pliable
• light
• squishy
• supple
• pliant
• floppy
• limp
• slack
• porous
• flaccid
• squashy
• airy
• permeable
• droopy
• bendable
• lank
• ultrasoft

3

as in self

having or consisting of a single color

both kittens are black, but one has a solid coat and the other has a few white patches

Synonyms & Similar Words

• self
• neutral
• monochrome
• monochromatic
• self-colored
• monochromic
• achromatic

Antonyms & Near Antonyms

• colorful
• varied
• rainbow
• multicolored
• variegated
• shaded
• chromatic
• kaleidoscopic
• varicolored
• polychromatic
• polychrome
• marbled
• dappled
• motley
• striated
• striped
• mottled
• barred
• dotted
• banded
• streaked
• checkered
• pied
• patterned
• speckled
• pinto
• plaid
• flecked
• specked
• brindled
• spotted
• skewbald
• parti-color
• trichromatic
• piebald
• dichromatic
• tricolor
• bicolored
• two-tone
• bichrome

4

as in strong

not showing weakness or uncertainty

some people see a solid handshake as a sign of strong character

Synonyms & Similar Words

• strong
• sturdy
• firm
• vigorous
• robust
• powerful
• iron
• tough
• stout
• forceful
• hearty
• lusty
• mighty
• hard
• ironclad
• lively
• unyielding
• brisk
• energetic
• confident
• spirited
• vital
• animated
• perky
• jazzy
• springy
• vivacious
• sprightly
• secure
• peppy
• certain
• jaunty
• frisky
• sure
• assured
• zippy
• sanguine
• sprightful

Antonyms & Near Antonyms

• weak
• uncertain
• feeble
• fragile
• frail
• listless
• limp
• spiritless
• insecure
• diffident
• wimpy
• weakened
• characterless
• spineless
• effete
• wishy-washy
• self-doubting
• weak-kneed

5

as in reliable

worthy of one's trust

a solid source of information to reporters

Synonyms & Similar Words

• reliable
• good
• true
• steady
• safe
• responsible
• dependable
• secure
• trustworthy
• loyal
• strong
• trusty
• sure
• calculable
• tried
• tried-and-true
• constant
• trustable
• steadfast
• devoted
• faithful
• fast
• staunch
• honest
• effective
• sound
• proven
• sincere
• valid
• firm
• infallible
• unerring
• true-blue
• unquestionable
• confirmed
• unimpeachable
• impeccable
• validated
• faultless
• single-minded
• bedrock
• irreproachable
• telling
• verified
• attested
• authenticated
• blameless
• guiltless
• inerrant

Antonyms & Near Antonyms

• uncertain
• unreliable
• unsafe
• false
• untrustworthy
• undependable
• treacherous
• untrue
• questionable
• traitorous
• shaky
• disloyal
• unfaithful
• fickle
• inconstant
• dodgy
• perfidious
• problematic
• faithless
• uncertain
• doubtful
• lying
• dubious
• dishonest
• hazardous
• deceitful
• debatable
• unsound
• suspect
• mendacious
• risky
• shady
• untruthful
• fishy
• disputable
• recreant
• untried
• unconfirmed
• doubtable

Example Sentences

Recent Examples of solid

Researchers from the University of Electro-Communications (UEC Tokyo) and Nichia Corporation have investigated a solid electrolyte made primarily from relatively light elements. — Kaif Shaikh, Interesting Engineering, 7 Oct. 2026

Southern Living recommends Rhodes Big View Overlook along Highway 64 as a solid viewing spot. — Eva Flowe october 7, Charlotte Observer, 7 Oct. 2026

Sometimes pit stains happen—but that’s nothing a solid deodorant can’t handle. — Madison San Miguel, Allure, 7 Oct. 2026

Bloomberg reports that insiders say Gemini 4 has solid model efficacy, but isn’t as stellar when employees actually use it, and that the model has issues with some coding tasks. — John Kell, Fortune, 7 Oct. 2026