strenuous

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• February 15. 2013 from wordnet.princeton.edu

  strenuous — adjective — english

  characterized by or performed with much energy or force; "strenuous exercise"

• March 31. 2016 from wordnet.princeton.edu

  strenuous — adjective — english

  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