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.
- Lacking the necessary power, authority, or means; not able; incapable: unable to get to town without a car.
- Lacking mental or physical capability or efficiency; incompetent: unable to walk.
- Usage Problem Not susceptible to action or treatment: a project unable to be financed with government funds. See Usage Note at able.