incapable
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(a) (followed by "of") lacking capacity or ability
- incapable of carrying a tune
- he is incapable of understanding the matter
- incapable of doing the work
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(s) not being susceptible to or admitting of something (usually followed by "of")
- incapable of solution
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(a) (followed by "of") not having the temperament or inclination for
- simply incapable of lying
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(s) not meeting requirements
- unequal to the demands put upon him