From The Collaborative International Dictionary of English v.0.48:

Unable \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.
   [1913 Webster]

         Sapless age and weak unable limbs.       --Shak.
   [1913 Webster]
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