/ ˈstrenjuəs; NAmE / adjective
1.
needing great effort and energy
SYN arduous :
a strenuous climb
Avoid strenuous exercise immediately after a meal.
How about a stroll in the park? Nothing too strenuous .
2.
showing great energy and determination :
The ship went down although strenuous efforts were made to save it.
► strenu·ous·ly adverb :
He still works out strenuously every morning.
The government strenuously denies the allegations.
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WORD ORIGIN
early 17th cent.: from Latin strenuus brisk + -ous .