strenuous

adjectives

characterized by or performed with much energy or force

"strenuous exercise"

strenuous

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is derived from

is derived from

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possessing or exerting or displaying energy

"an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction"

taxing to the utmost; testing powers of endurance

"his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt

arduous, straining, strenuous

is derived from

is derived from