adjective

strenuous

strenuous, arduous, demanding

He made a strenuous effort to finish.

He made a strenuous effort to finish.

Avoid strenuous exercise in hot weather.

Avoid strenuous exercise in hot weather.

a strenuous ((noun)) requiring great effort or energy He made a strenuous effort to finish.

Synonyms: arduous, demanding, difficult; Antonyms: easy, effortless

From Latin 'strenuus' meaning 'brisk, active, vigorous'. The '-ous' suffix means 'full of'.

It sounds a bit like 'strain us'. A strenuous task is one that will 'strain us'.

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