1.(followed by `of') lacking capacity or ability;
incapable of carrying a tune
2.not being susceptible to or admitting of something (usually followed by `of');
incapable of solution
3.lacking the necessary skill or knowledge etc.;
an incapable helper
4.(followed by `of') not having the temperament or inclination for;
simply incapable of lying
5.not meeting requirements;
unequal to the demands put upon him