sound

sound

adjective

Definition of SOUND

1

according to the rules of logic <sound reasoning alone should tell you that the result is invalid>

Synonyms analytic (or analytical), coherent, consequent, good, rational, reasonable, sensible, sound, valid, well-founded, well-grounded

Related Words a posteriori, a priori, syllogistic; cognitive, empirical (also empiric); defendable, defensible, justifiable, maintainable, supportable, sustainable, tenable

Near Antonyms casuistic (or casuistical), eristic (also eristical), fallacious, misleading, sophistic (or sophistical), specious; unarticulated; unscientific; absurd, cockeyed, crazy, daffy, fatuous, half-baked, half-witted, harebrained, insane, loony (also looney), mad, nonsensical, nutty, preposterous, simpleminded, stupid, weak-minded, witless; senseless, thoughtless; uncompelling, unconvincing

Antonyms illegitimate, illogical, incoherent, inconsequent, inconsequential, invalid, irrational, unreasonable, unsound, weak

2

enjoying health and vigor <the horse is getting along in years, but still perfectly sound>

Synonyms able-bodied, bouncing, fit, hale, hearty, robust, sound, well, well-conditioned, whole, wholesome

Related Words hard, hardy, iron, lusty, rugged, stalwart, strong, sturdy, tough; ambulatory, nondisabled, uncrippled; active, agile, chipper, lively, sprightful, sprightly, spry, vigorous, vital; blooming, clean-cut, flourishing, flush, prospering, thriving; all right, good, right

Near Antonyms decrepit, enfeebled, feeble, infirm, run-down, sickened, sickly, weak, weakened, weakly, worn-out; challenged, crippled, debilitated, differently abled, disabled, halt, incapacitated, lame; delicate, fragile, frail; emaciated, gaunt, haggard, malnourished, undernourished; afflicted, troubled; bad, poorly

Antonyms ailing, diseased, ill, sick, unfit, unhealthy, unsound, unwell

3

marked by the ability to withstand stress without structural damage or distortion <the shed looks flimsy, but it's actually surprisingly sound>

Synonyms bombproof, fast, firm, sound, stalwart, strong, sturdy

Related Words dependable, durable, reliable; infrangible, irrefragable, unbreakable; beefy, solid; cohesive, tough

Near Antonyms infirm, insecure, weak; shaky, tottering, tottery, unbalanced, wobbly (also wabbly); unsubstantial

Antonyms rickety, unsound, unstable, unsteady