- (of a building, etc.) in poor condition; weak and likely to fall down
- The roof is structurally unsound.
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- not acceptable; not based on reliable evidence
- ideologically unsound
- The use of disposable products is considered ecologically unsound.
- This line of argument is unsound.
- containing mistakes; that you cannot rely on synonym unreliable
- The methods used were unsound.
opposite sound
Idioms
See unsound in the Oxford Advanced American Dictionaryof unsound mind
- (law) not responsible for your actions because of a mental illness
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unsound