unsound

Adjective

• of e.g. advice

• physically unsound or diseased
  • has a bad back
    
  • a bad heart
    
  • bad teeth
    
  • an unsound limb
    
  • unsound teeth
    

• suffering from severe mental illness
  • of unsound mind
    

• containing or based on a fallacy
  • fallacious reasoning
    
  • an unsound argument
    

• not sound financially
  • unsound banking practices
    

• not in good condition; damaged or decayed
  • an unsound foundation
    

Related words

• Synonyms: 
  bad , unfit , mentally ill , unstable , fallacious