Etymology
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strenuous (adj.)

"characterized by great effort," mid-15c. (implied in strenuously), from Latin strenuus "active, brisk, quick, nimble, prompt, vigorous, keen." Probably cognate with Greek strēnes, strēnos "keen, strong," strenos "arrogance, eager desire," Old English stierne "hard, severe, keen" (see stern (adj.)). Mocked by Ben Jonson as a pedantic neologism in "Poetaster" (1601). Sense of "requiring much energy" is first recorded 1670s. Related: Strenuousness; strenuosity.

updated on May 28, 2019

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Definitions of strenuous from WordNet

strenuous (adj.)
characterized by or performed with much energy or force;
strenuous exercise
strenuous (adj.)
taxing to the utmost; testing powers of endurance; "your willingness after these six arduous days to remain here"- F.D.Roosevelt;
a strenuous task
Synonyms: arduous / straining
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.