SOUND

adj. 1 undamaged, uninjured, whole, unmarred, in good condition or shape, intact, unimpaired, unscathed When the vase was sold to you it was sound 2 healthy, hale (and hearty), fit (as a fiddle), robust, vigorous, blooming, rosy, ruddy Old Tom is as sound as ever 3 firm, solid, substantial, strong, sturdy, tough, rugged, durable, well-built, well-constructed, dependable A business, like a building, must be built on sound foundations if it is to last 4 sane, balanced, normal, rational, wholesome, reasoning, reasonable, clear-headed, lucid, right-minded, responsible, practical, prudent, politic, wise, sensible, logical, common-sense, commonsensical, astute, far-sighted, perceptive, perspicacious, percipient; valid, good, judicious, reliable, useful As Juvenal said, 'Mens sana in corpore sano,' or 'A sound mind in a sound body' My old teacher gave me a lot of sound advice. 5 safe, secure, good, conservative, non-speculative, solid, riskless; profitable Are you sure that utilities are a sound investment now? 6 unbroken, uninterrupted, undisturbed, untroubled, peaceful, deep: I drank the potion and at once fell into a sound sleep