solid

1 based on sound reasoning or information the only solid conclusion that the jury could have reached Synonyms commonsense, commonsensible, commonsensical, firm, hard, informed, just, justified, levelheaded, logical, rational, reasonable, reasoned, sensible, sober, good, valid, well-foundedRelated Words actual, real, true; certain, sure; certified, validated, verified; confirmed, corroborated, substantiated; cogent, convincing; colorable, credible, plausibleNear Antonyms unsubstantiated, unsupported, unwarranted; flimsy, implausible, unconvincing, weak; fallacious, false, misguided, misledAntonyms groundless, illogical, invalid, irrational, nonrational, nonsensical, nonvalid, unfounded, uninformed, unjustified, unreasonable, unreasoned, unsound

2 having a consistency that does not easily yield to pressure the ice cream is too solid to scoop right now Synonyms compact, hard, rigid, firm, stiff, unyieldingRelated Words case-hardened, compacted, compressed, hardened, indurated, stiffened, tempered; close, dense, heavy, thick, thickset; inelastic, inflexible, ramrod, unbending; compressed, condensed; adamantine, rocklike; sturdy, substantial; impenetrable, impermeable, nonporousNear Antonyms loose, scattered, thin; bendable, elastic, flexible, malleable, pliable, pliant, supple; droopy, flaccid, floppy, lank, limp, slack; airy, light; permeable, porous; ultrasoftAntonyms flabby, soft, spongy, squashy, squishy

3 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 monochrome, monochromic, self, self-colored, monochromaticRelated Words achromatic, neutralNear Antonyms dappled (also dapple), marbled, shaded; mottled, parti-color (or parti-colored), piebald, pied, pinto, skewbald; banded, barred, brindled (or brindle), streaked, striated; checkered, dotted, patterned, plaid, striped; flecked, specked, speckled, spotted; bichrome, bicolored (or bicolor), dichromatic, trichromatic, tricolor (or tricolored), two-toneAntonyms chromatic, colorful, kaleidoscopic, motley, multicolored, polychromatic, polychrome, rainbow, varicolored, varied, variegated

4 not showing weakness or uncertainty some people see a solid handshake as a sign of strong character Synonyms forceful, hearty, iron, lusty, robust, firm, stout, strong, sturdy, vigorousRelated Words hard, ironclad, mighty, powerful, tough, unyielding; animated, brisk, energetic, frisky, jaunty, jazzy, lively, peppy, perky, spirited, sprightful, sprightly, springy, vital, vivacious, zippy; assured, certain, confident, sanguine, secure, sureNear Antonyms feeble, fragile, frail; limp, listless, spiritless; diffident, insecure, self-doubting; characterless, effete, frail, spineless, weakened, weak-kneed, wimpy, wishy-washyAntonyms uncertain, weak

5 worthy of one's trust a solid source of information to reporters Synonyms calculable, good, reliable, responsible, safe, secure, dependable, steady, sure, tried, tried-and-true, true, trustable, trustworthy, trustyRelated Words constant, devoted, faithful, fast, loyal, staunch (also stanch), steadfast, true-blue; honest, sincere, single-minded; infallible, unerring; bedrock, firm, sound, strong; effective, telling; attested, authenticated, confirmed, proven, valid, validated, verified; blameless, faultless, guiltless, impeccable, inerrant, irreproachable, unimpeachable, unquestionableNear Antonyms disloyal, faithless, false, fickle, inconstant, perfidious, recreant, traitorous, treacherous, unfaithful, untrue; deceitful, dishonest, lying, mendacious, untruthful; debatable, disputable, doubtable, doubtful, dubious, fishy, problematic (also problematical), questionable, shady, shaky, suspect, uncertain, unsound; hazardous, risky; unconfirmed, untriedAntonyms dodgy [chiefly British], uncertain, undependable, unreliable, unsafe, untrustworthy