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unable
Adjectiveunable has 3 senses
unable, not able - (usually followed by `to') not having the necessary means or skill or know-how; "unable to get to town without a car"; "unable to obtain funds" Antonym:able
ineffective, ineffectual, unable - lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes" Antonyms:potent, strong (indirect, via impotent)