## Etymology
From Latin strēnuus ('brisk, active, vigorous'), of uncertain ultimate origin but perhaps related to Ancient Greek strēnēs ('strong'); the English ending was reshaped to -ous.

## AI Etymology
Strenuous is from Latin strēnuus ('brisk, active, vigorous'), of uncertain ultimate origin but perhaps related to Ancient Greek strēnēs ('strong'); the English ending was reshaped to -ous. Important recorded forms include strēnuus (Latin). Morphologically, the ending or combining element adapts the older base to the present English part of speech while keeping the historical sense visible. The wording preserves that uncertainty: the older history is best read as a cautious account rather than a fully settled chain. The modern sense continues the older lexical line without requiring a separate origin. In current use it covers requiring or using great effort or energy. The wider family includes derived forms such as strenuously and strenuousness.

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