WordWeb Online

1. Not being susceptible to or admitting of something (usually followed by 'of')
   "incapable of solution"
    
2. Not meeting requirements
   - incompetent, unequal to
    
3. (followed by 'of') lacking capacity or ability
   "incapable of carrying a tune"; "he is incapable of understanding the matter"; "incapable of doing the work"
    
4. (followed by 'of') not having the temperament or inclination for
   "simply incapable of lying"

See also: capability, capableness, inadequate, incompetent, insusceptible, potentiality, unable, unequal, unsusceptible

Antonym: capable

Encyclopedia: Incapable