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English definition of “unsound”

unsound

adjective (WEAK)    /ʌnˈsaʊnd/
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.Unsafe and insecure
(Definition of unsound adjective (WEAK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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