"Incapable" is a word in ENGLISH

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.

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.

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.

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.

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