## Etymology
From un- ('not') plus used, the past participle of use, from Old French user, from Vulgar Latin *usare, frequentative of Latin uti ('to use').

## AI Etymology
Unused comes from un- ('not') plus used, the past participle of use, from Old French user, from Vulgar Latin *usare, frequentative of Latin uti ('to use'). In current use it is an adjective meaning "not having been used; not accustomed to". That sense is explained by the older material without requiring a speculative semantic step: the inherited or borrowed base supplies the field of meaning, while the English formation fixes its modern role. The prefix un- is negative or privative, marking the absence, denial, or opposite of the base idea. The surface form is compositional: its joined elements remain visible in the modern word. A frequentative element in the history points to repeated, habitual, or intensified action. The historical chain includes Old English un- and Latin uti. Related English forms include use, usable, and disused. As a result, the modern word is best read as a negative, privative, or reversative formation built on a historically older base.

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- Describing Qualities
- Word Formation & Derivatives

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