## Etymology
From uncertain + -ly. Certain comes from Old French certain, from Vulgar Latin *certanus, from Latin certus ('sure, fixed, determined'), past participle of cernere ('to distinguish, decide').

## AI Etymology
Uncertainly is from uncertain + -ly. Certain comes from Old French certain, from Vulgar Latin *certanus, from Latin certus ('sure, fixed, determined'), past participle of cernere ('to distinguish, decide'). Important recorded forms include un- (Old English), certus (Latin), and cernere (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 in a hesitant or doubtful manner. The wider family includes related words such as uncertain, certain, and uncertainty.

## Topics
- Describing Qualities
- Word Formation & Derivatives

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