noun one who is morally or mentally weak or inefficient; an imbecile; a simpleton.
2. incapable ·adj as a term of disgrace, sometimes annexed to a sentence when an officer has been cashiered and rendered incapable of serving his country.
3. incapable ·adj not in a state to receive; not receptive; not susceptible; not able to admit; as, incapable of pain, or pleasure; incapable of stain or injury.
4. incapable ·adj not capable of being brought to do or perform, because morally strong or well disposed;
used with reference to some evil; as, incapable of wrong, dishonesty, or falsehood.
5. incapable ·adj unqualified or disqualified, in a legal sense; as, a man under thirty-five years of age is incapable of holding the office of president of the united states; a person convicted on impeachment is thereby made incapable of holding an office of profit or honor under the government.
6. incapable ·adj wanting in ability or qualification for the purpose or end in view; not large enough to contain or hold; deficient in physical strength, mental or moral power, ·etc.; not capable; as, incapable of holding a certain quantity of liquid; incapable of endurance, of comprehension, of perseverance, of reform, ·etc.