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