| strenuous | | |
| adj. | 1. strenuous | characterized by or performed with much energy or force.; "strenuous exercise" |
| ~ energetic | possessing or exerting or displaying energy.; "an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction" |
| adj. | 2. arduous, straining, strenuous | taxing to the utmost; testing powers of endurance.; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here" |
| ~ effortful | requiring great physical effort. |
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