Longman Dictionary of Contemporary English homepage

unsound

 adjective
     
un‧sound
1 not based on facts or good reasons
ideologically/scientifically/ecologically etc unsound
a test that's scientifically unsound
2 an unsound building or structure is in bad condition:
The houses are structurally unsound.
3 formal physically or mentally ill:
people of unsound mind (=people who are mentally ill)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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