Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not able; lacking a certain ability.

from the GNU version of the Collaborative International Dictionary of English

  • adj. 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.

from The Century Dictionary and Cyclopedia

  • Not able.
  • Lacking in ability; incapable.
  • Weak; helpless; useless.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (usually followed by `to') not having the necessary means or skill or know-how
  • adj. lacking in power or forcefulness
  • adj. (usually followed by `to') lacking necessary physical or mental ability

Etymologies

un- +‎ able (Wiktionary)

Examples

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