Webster's English Dictionary

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strenuous

Cross references:
  1. vigorous              
 
stren.u.ous \'stren-y*-w*s\ aj [L strenuus - more at STARE] 1a: vigorously 
   active : ENERGETIC  1b: FERVENT, ZEALOUS  2: marked by or calling for 
   energy or stamina : ARDUOUS  - stren.u.ous.ly av