strenuous (adj.)youdaoicibaDictYouDict[strenuous 词源字典]
"characterized by great effort," mid-15c. (implied in strenuously), from Latin strenuus "active, brisk, quick, nimble, prompt, 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: Strenuousness; strenuosity.[strenuous etymology, strenuous origin, 英语词源]