## Etymology
From undeniable (un- 'not' + deniable) + -ly. Deny is from Old French denier, from Latin denegare ('to deny, refuse'), from de- + negare ('to deny, say no').

## AI Etymology
Undeniably comes from undeniable (un- 'not' + deniable) + -ly. Deny is from Old French denier, from Latin denegare ('to deny, refuse'), from de- + negare ('to deny, say no'). The historical chain includes Old English -ly, Latin denegare, and Latin negare. The quoted older senses, "not", "to deny, refuse", and "to deny, say no", supply the semantic anchors for undeniably. The formation is best read as suffixal, compound, and borrowed: the word undeniably carries its older form-history into a compact English lexical shape. In present English it is used as a adv, "in a way that cannot be denied or disputed". Related English forms include undeniable, deny, and denial. The result is a adv whose etymology preserves both the older form and the later English specialization.

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