unable

Definition of Unable in English :

1. unable

(usually followed by to') not having the necessary means or skill or know-how

Example Sentences:
'unable to get to town without a car'
'unable to obtain funds'

2. unable

(usually followed by to') lacking necessary physical or mental ability

Example Sentences:
'dyslexics are unable to learn to read adequately'
'the sun was unable to melt enough snow'

lacking in power or forcefulness

Example Sentences:
'an ineffectual ruler'
'like an unable phoenix in hot ashes'

WordNet Lexical Database for English. Princeton University. 2010.

Unable

adjective

1. (postpositive; foll by to)

lacking the necessary power, ability, or authority (to do something); not able

2. archaic

incompetent

adjective

1.

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

2.

incompetent

3.

helpless; feeble

adj.

1. Lacking the necessary power, authority, or means; not able; incapable: unable to get to town without a car.

2. Lacking mental or physical capability or efficiency; incompetent: unable to walk.

3. Usage Problem Not susceptible to action or treatment: a project unable to be financed with government funds. See Usage Note at able.