## Etymology
From unquestionable + -ly, ultimately from un- ('not') + question, from Latin quaestio ('a seeking, inquiry'), from quaerere ('to seek').

## AI Etymology
Unquestionably comes from unquestionable + -ly, ultimately from un- ('not') + question, from Latin quaestio ('a seeking, inquiry'), from quaerere ('to seek'). In current use it is an adverb meaning "beyond doubt; certainly". 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 final -ly makes the underlying adjective or participial form adverbial. The surface form is compositional: its joined elements remain visible in the modern word. The historical chain includes Old English un- and Latin quaerere. Related English forms include question, unquestionable, and questionable. 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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- Mind & Cognition
- Word Formation & Derivatives

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