/ ˌʌnˈsaʊnd; NAmE / adjective
1.
not acceptable; not holding acceptable views :
ideologically unsound
The use of disposable products is considered ecologically unsound.
2.
containing mistakes; that you cannot rely on
SYN 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 .
OPP sound
► un·sound·ness noun [ U ]
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IDIOMS
- of unsound mind