incapable

adjective

1. 1

   not meeting requirements

   unequal to the demands put upon him

2. 2

   (followed by `of') lacking capacity or ability

   incapable of carrying a tune

   he is incapable of understanding the matter

3. 3

   (followed by `of') not having the temperament or inclination for

   simply incapable of lying

4. 4

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

   incapable of solution