unsound /ˌʌnˈsaʊnd/ adjective Learner's definition of UNSOUND
[more unsound; most unsound]
1
: not based on truth or logic : not showing good judgment无根据的;谬误的 2
: poorly built or in bad condition不坚固的;破旧的
of unsound mind
law
: mentally ill : not sane精神失常的