adjective
describing the manner in which something is done with great effort or energy
adverb
in a way that involves a lot of effort or energy
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The lawyer strenuously argued his case in front of the judge.
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She strenuously defended her friend during the argument.
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I'm gonna have to strenuously work out if I want to fit into those jeans.
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The artist's brush moved strenuously across the canvas, creating a masterpiece.