strenuous
/ˈstrɛnjəwəs/
adjective
Britannica Dictionary definition of STRENUOUS
[more strenuous; most strenuous]
:
requiring or showing great energy and effort
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Avoid all strenuous exercise until the sprain heals.
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a strenuous climb
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Today has been a very strenuous day.
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strenuous efforts
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The proposal has faced strenuous opposition.