unsound meaning and definition

UNSOUND adjective

Definition of unsound (adjective)

1. not in good condition; damaged or decayed
   • "an unsound foundation"
   • antonym: sound
2. not sound financially
   • "unsound banking practices"
   • antonym: sound
3. containing or based on a fallacy
   • "fallacious reasoning"; "an unsound argument"
   • synonyms: fallacious
4. suffering from severe mental illness
   • "of unsound mind"
   • synonyms: mentally ill, unstable
5. physically unsound or diseased
   • "has a bad back"; "a bad heart"; "bad teeth"; "an unsound limb"; "unsound teeth"
   • synonyms: bad, unfit
6. of e.g. advice