Etymology
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inability (n.)

mid-15c., inhabilite, "disqualification for office," from in- (1) + ability. Earlier was unability "incapability; incompetence" (late 14c.). General sense "state of being unable" is recorded by c. 1500.

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Definitions of inability

inability (n.)
lack of ability (especially mental ability) to do something;
inability (n.)
lacking the power to perform;
Synonyms: unfitness
From wordnet.princeton.edu