un·able /ˌʌnˈebəl/
 (a.)不能的,不會的,沒有辦法的


 Un·a·ble a. Not able; not having sufficient strength, means, knowledge, skill, or the like; impotent; weak; helpless; incapable; -- now usually followed by an infinitive or an adverbial phrase; as, unable for work; unable to bear fatigue.
    Sapless age and weak unable limbs.   --Shak.

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 unable
      adj 1: (usually followed by `to') not having the necessary means or
             skill or know-how; "unable to get to town without a
             car"; "unable to obtain funds" [syn: not able] [ant:
              able]
      2: (usually followed by `to') lacking necessary physical or
         mental ability; "dyslexics are unable to learn to read
         adequately"; "the sun was unable to melt enough snow"
         [syn: unable(p)]
      3: lacking in power or forcefulness; "an ineffectual ruler";
         "like an unable phoenix in hot ashes" [syn: ineffective,
          ineffectual]