Lacking 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.

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.

One who is morally or mentally weak or inefficient; an imbecile; a simpleton.

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.

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

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

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.

As a term of disgrace, sometimes annexed to a sentence when an officer has been cashiered and rendered incapable of serving his country.

An SSA determination that a beneficiary is unable to manage or direct the management his or her funds. This incapability determination is based on all available evidence and is used to support a need for a representative payee. An incapable beneficiary is not always “legally incompetent”.

not meeting requirements; "unequal to the demands put upon him"