unable

Lacking the necessary power, authority, or means; not able; incapable.

Lacking mental or physical capability or efficiency; incompetent.

Not susceptible to action or treatment.

Not able.

Lacking in ability; incapable.

Weak; helpless; useless.

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.

Not able; lacking a certain ability.

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

lacking in power or forcefulness