## Etymology
From un- ('not') + ability. Ability derives from Old French ablete, from Latin habilitas ('aptitude, fitness'), from habilis ('handy, apt'), from habere ('to have, hold').

## AI Etymology
Unability is from un- ('not') + ability. Ability derives from Old French ablete, from Latin habilitas ('aptitude, fitness'), from habilis ('handy, apt'), from habere ('to have, hold'). Important recorded forms include un- (Old English), habilitas (Latin), and habere (Latin). Morphologically, the un- element marks negation, reversal, removal, or deprivation, while the base supplies the action, quality, or state being denied or undone. The modern sense continues the older lexical line without requiring a separate origin. In current use it covers lack of ability; inability. The wider family includes related words such as ability, able, unable, and disability.

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- Word Formation & Derivatives

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