Definition of unsound adjective from the Oxford Advanced American Dictionary

     

    unsound

     adjective
    adjective
    NAmE//ʌnˈsaʊnd//
     
     
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  1. 1not acceptable; not holding acceptable views ideologically unsound The use of disposable products is considered ecologically unsound.
  2. 2containing mistakes; that you cannot rely on synonym unreliable The methods used were unsound.
  3. 3(of a building, etc.) in poor condition; weak and likely to fall down The roof is structurally unsound. opposite sound
  4. Idioms
    of unsound mind(law)
     
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    not responsible for your actions because of a mental illness
unsoundness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: unsound

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