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English definition of “unsound”

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unsound

adjective uk   /ʌnˈsaʊnd/ us  

unsound adjective (NOT ACCEPTABLE)

If a person's activities or judgment are unsound, they are not good enough, acceptable, or able to be trusted: unsound accounting practices unsound police evidence

unsound adjective (WEAK)

If a building or other structure is unsound, it is in bad condition and likely to fall down or fail: The bridge is one of several said to be structurally unsound.
(Definition of unsound from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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