strenuous


Concise Oxford English Dictionary © 2008 Oxford University Press:
strenuous /ˈstrɛnjʊəs/
adjective requiring or using great exertion.
– derivatives
strenuously adverb,
strenuousness noun.
– origin C17: from L. strenuus ‘brisk’ + -ous.
'strenuous' also found in these Oxford entries:

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