incapable

Adjective

• not meeting requirements
  • unequal to the demands put upon him
    

• (followed by `of') not having the temperament or inclination for
  • simply incapable of lying
    

• not being susceptible to or admitting of something (usually followed by `of')
  • incapable of solution
    

• (followed by `of') lacking capacity or ability
  • incapable of carrying a tune
    
  • he is incapable of understanding the matter
    
  • incapable of doing the work
    

Related words

• Synonyms: 
  incompetent , unequal to(p) , incapable(p)