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strenuous

 
Adjective strenuous has 2 senses
  1. strenuous - characterized by or performed with much energy or force; "strenuous exercise"
    Antonyms:
    lethargic, unergetic (indirect, via energetic)
  2. arduous, straining, strenuous - 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
    Antonym: effortless (indirect, via effortful)
strengthens strengthless strengths strenht strenous strenth strenuos strenuosity strenuous strenuously strenuousness strep strep throat strepera strepsiceros strepsirhini streptobacillus

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