"unsound" in the adjective sense
1. unsound
not in good condition damaged or decayed
"an unsound foundation"
2. unsound
not sound financially
"unsound banking practices"
3. fallacious, unsound
containing or based on a fallacy
"fallacious reasoning"
"an unsound argument"
4. mentally ill, unsound, unstable
suffering from severe mental illness
"of unsound mind"
5. bad, unfit, unsound
physically unsound or diseased
"has a bad back"
"a bad heart"
"bad teeth"
"an unsound limb"
"unsound teeth"
6. unsound
of e.g. advice
Source: WordNet® (An amazing lexical database of English)
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