## Etymology
From sudden + -ness. Sudden is from Anglo-Norman sodeyn, from Old French sodain, from Latin subitāneus ('sudden'), from subitus ('sudden'), from subīre ('to come up stealthily').

## AI Etymology
Suddenness is from sudden + -ness. Sudden is from Anglo-Norman sodeyn, from Old French sodain, from Latin subitāneus ('sudden'), from subitus ('sudden'), from subīre ('to come up stealthily'). Important recorded forms include subitāneus (Latin) and subīre (Latin). Morphologically, the native -ness suffix turns an adjective or quality word into an abstract noun naming the state or condition. The modern sense is largely compositional, with the historical elements narrowing into a stable English lexical item. In current use it covers the quality of happening quickly and unexpectedly. The wider family includes related words such as sudden and suddenly.

## Topics
- Describing Qualities
- Word Formation & Derivatives

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