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English definition of “unsound”

unsound

adjective  /ʌnˈsɑʊnd/ us  

unsound adjective (NOT ACCEPTABLE)

(esp. of activities) not suitable or acceptable: He was involved in unsound banking practices.

unsound adjective (WEAK)

(esp. of a building) in bad condition and likely to fall down or fail: The bridge is structurally unsound.
(Definition of unsound from the Cambridge Academic Content Dictionary © Cambridge University Press)
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