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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]