sound

sound adjective accurate, acknowledged, admitted, cogent, compelling, convincing, correct, credible, effective, effectual, efficacious, factual, forceful, incontrovertible, irrefutable, justified, legitimate, persuasive, potent, powerful, proven, right, rightful, scientific, solid, strong, substantial, true, truthful, unanswerable, unchallengeable, unconfutable, undisputable, undistorted, unexaggerated, unimagined, unimpeachable, veracious, veritable, weighty, well-founded, well-grounded
Associated concepts: sound discretion, sound value

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See also: authentic, cogent, communicate, credible, defensible, discriminating, durable, fiduciary, firm, fixed, honest, incontestable, indomitable, intact, intonation, inviolate, judicious, juridical, justifiable, legitimate, licit, logical, lucid, meritorious, noise, normal, persuasive, phrase, plausible, positive, pragmatic, pronounce, rational, reasonable, reliable, rightful, safe, sane, scrupulous, secure, sensible, speak, stable, staunch, strong, thorough, true, unblemished, undeniable, utter, valid, viable