- characterized by vigorous exertion, as action, efforts, life, etc.: a strenuous afternoon of hunting.
- demanding or requiring vigorous exertion; laborious: To think deeply is a strenuous task.
- vigorous, energetic, or zealously active: a strenuous person; a strenuous intellect.
- requiring or involving the use of great energy or effort
- characterized by great activity, effort, or endeavour
adj.“characterized by great effort,” 1590s, from Latin strenuus “active, vigorous, keen.” Probably cognate with Greek strenes, strenos “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: Strenuously; strenuousness.