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English definition of “strenuous”

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strenuous

adjective uk   /ˈstren.ju.əs/ us  
C2 needing or using a lot of physical or mental effort or energy: He rarely does anything more strenuous than changing the channels on the television. His doctor advised him not to take any strenuous exercise. Strenuous efforts were made throughout the war to disguise the scale of civilian casualties.
strenuously
adverb uk   /-li/ us  
He strenuously denies all the allegations against him. Most local residents strenuously object to the building proposals.
(Definition of strenuous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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