1 arduous, demanding, exhausting, hard, Herculean, laborious, taxing, toilsome, tough, tough going, unrelaxing, uphill
2 active, bold, determined, eager, earnest, energetic, persistent, resolute, spirited, strong, tireless, vigorous, zealous
1 easy, effortless, relaxing, undemanding, untaxing
English Collins Dictionary - English synonyms & Thesaurus
A strenuous activity or action involves a lot of energy or effort. adj
Avoid strenuous exercise in the evening..., Strenuous efforts had been made to improve conditions in the jail...
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