Cannot vs. Unable

Cannotverb

Can not (be unable to).

Cannotverb

Be forbidden or not permitted to

Cannot

Am, is, or are, not able; - written either as one word or two.

Unableadjective

Not able; lacking a certain ability.

Unableverb

To render unable; disable

Unableadjective

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.

Unableadjective

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

Unableadjective

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

Unableadjective

lacking in power or forcefulness;