WordWeb Online

1. Not in good condition; damaged or decayed
   "an unsound foundation"
    
2. Not sound financially
   "unsound banking practices"
    
3. Containing or based on a fallacy
   "an unsound argument"
   - fallacious
    
4. Suffering from severe mental illness
   "of unsound mind"
   - mentally ill, unstable
    
5. Physically unsound or diseased
   "an unsound limb"; "unsound teeth"
   - bad, unfit
    
6. Of e.g. advice

Derived forms: unsounder, unsoundest

See also: bad, broken, corroded, damaged, decayed, high-risk, injured, insane, invalid, long, risky, rotted, rotten, speculative, undependable, unfit, unhealthy, unreliable, unsoundness, unwholesome, wildcat

Antonym: sound

Encyclopedia: Unsound