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Definition of: unsound
(un·sound′) adjective
1. Lacking in soundness; not having material strength and solidity; weak; rotten.
2. Not sound in health; diseased.
3. Not logically valid; erroneous; in religion, heterodox.
4. Disturbed; not profound: said of sleep.
—un·sound′ly adverb
—un·sound′ness noun
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