## Etymology
From un- ('not') + accustomed, past participle of accustom, from Old French acostumer, from a- + costume ('custom, habit'), from Latin consuetudo ('custom, habit').

## AI Etymology
Unaccustomed is from un- ('not') + accustomed, past participle of accustom, from Old French acostumer, from a- + costume ('custom, habit'), from Latin consuetudo ('custom, habit'). Important recorded forms include un- (Old English), acostumer (Old French), and consuetudo (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 is largely compositional, with the historical elements narrowing into a stable English lexical item. In current use it covers not used to something; unfamiliar or unusual. The wider family includes derived forms such as unaccustomedly and related words such as accustom, custom, customary, and accustomed.

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- Describing Qualities
- Word Formation & Derivatives

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