in·ca·pa·ble /(ˌ)ɪnˈkepəbəl/
  (a.)無能力的,不能的
  In·ca·pa·ble a.
  1. 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.
  2. 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.
  3. 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. Law 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.
  5. Mil. As a term of disgrace, sometimes annexed to a sentence when an officer has been cashiered and rendered incapable of serving his country.
  Note: ☞ Incapable is often used elliptically.
     Is not your father grown incapable of reasonable affairs?   --Shak.
  Syn: -- Incompetent; unfit; unable; insufficient; inadequate; deficient; disqualified. See Incompetent.
  In·ca·pa·ble, n. One who is morally or mentally weak or inefficient; an imbecile; a simpleton.
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  incapable
       adj 1: (followed by `of') lacking capacity or ability; "incapable
              of carrying a tune"; "he is incapable of understanding
              the matter"; "incapable of doing the work" [ant: capable]
       2: not being susceptible to or admitting of something (usually
          followed by `of'); "incapable of solution" [syn: incapable(p)]
       3: lacking the necessary skill or knowledge etc.; "an incapable
          helper" [syn: unqualified]
       4: (followed by `of') not having the temperament or inclination
          for; "simply incapable of lying" [ant: capable]
       5: not meeting requirements; "unequal to the demands put upon
          him" [syn: incompetent, unequal to(p)]