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unable

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The definition of unable is a person or thing that doesn't have the ability, power or authority to do something.

(adjective)

An example of unable is someone not being qualified to fly a plane.

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See unable in Webster's New World College Dictionary

adjective

not able; lacking the ability, means, or power to do something
incompetent
helpless; feeble

See unable in American Heritage Dictionary 4

adjective

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.

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