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

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

Antonym: capable

Encyclopedia: Incapable