Antonyms of adj unsound

6 senses of unsound

Sense 1
unsound (vs. sound) -- (not in good condition; damaged or decayed; "an unsound foundation")

sound (vs. unsound) -- (in good condition; free from defect or damage or decay; "a sound timber"; "the wall is sound"; "a sound foundation")
        => solid, strong, substantial -- (of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings")

Sense 2
unsound (vs. sound) -- (not sound financially; "unsound banking practices")

sound (vs. unsound) -- (financially secure and safe; "sound investments"; "a sound economy")
        => dependable, good, safe, secure -- (financially sound; "a good investment"; "a secure investment")
        => healthy -- (financially secure and functioning well; "a healthy economy")
        => solid -- (financially sound; "the bank is solid and will survive this attack")
        => stable -- (firm and dependable; subject to little fluctuation; "the economy is stable")

Sense 3
fallacious, unsound -- (containing or based on a fallacy; "fallacious reasoning"; "an unsound argument")

INDIRECT (VIA invalid) -> valid -- (well grounded in logic or truth or having legal force; "a valid inference"; "a valid argument"; "a valid contract")

Sense 4
mentally ill, unsound, unstable -- (suffering from severe mental illness; "of unsound mind")

INDIRECT (VIA insane) -> sane -- (mentally healthy; free from mental disorder; "appears to be completely sane")

Sense 5
bad, unfit, unsound -- (physically unsound or diseased; "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth")

INDIRECT (VIA unhealthy) -> healthy -- (having or indicating good health in body or mind; free from infirmity or disease; "a rosy healthy baby"; "staying fit and healthy")

Sense 6
unsound -- (of e.g. advice)

INDIRECT (VIA unreliable, undependable) -> reliable, dependable -- (worthy of reliance or trust; "a reliable source of information"; "a dependable worker")
INDIRECT (VIA unreliable, undependable) -> reliable, dependable -- (worthy of reliance or trust; "a reliable source of information"; "a dependable worker")

Similarity of adj unsound

6 senses of unsound

Sense 1
unsound (vs. sound) -- (not in good condition; damaged or decayed; "an unsound foundation")
       => corroded -- (eaten away as by acid or oxidation)
       => decayed, rotten, rotted -- (damaged by decay; hence unsound and useless; "rotten floor boards"; "rotted beams"; "a decayed foundation")

Sense 2
unsound (vs. sound) -- (not sound financially; "unsound banking practices")
       => bad, risky, high-risk, speculative -- (not financially safe or secure; "a bad investment"; "high risk investments"; "anything that promises to pay too much can't help being risky"; "speculative business enterprises")
       => long -- (involving substantial risk; "long odds")
       => wildcat -- (outside the bounds of legitimate or ethical business practices; "wildcat currency issued by irresponsible banks"; "wildcat stock speculation"; "a wildcat airline"; "wildcat life insurance schemes")
          Also See-> broken#1; damaged#1; injured#1; unfit#2; unhealthy#1; unwholesome#1

Sense 3
fallacious, unsound -- (containing or based on a fallacy; "fallacious reasoning"; "an unsound argument")
       => invalid (vs. valid) -- (having no cogency or legal force; "invalid reasoning"; "an invalid driver's license")

Sense 4
mentally ill, unsound, unstable -- (suffering from severe mental illness; "of unsound mind")
       => insane (vs. sane) -- (afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter")

Sense 5
bad, unfit, unsound -- (physically unsound or diseased; "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth")
       => unhealthy (vs. healthy) -- (not in or exhibiting good health in body or mind; "unhealthy ulcers")

Sense 6
unsound -- (of e.g. advice)
       => unreliable (vs. reliable), undependable (vs. dependable) -- (not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant")