Webster's English Dictionary

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rigorous

Cross references:
  1. rigid                 
 
rig.or.ous \'rig-(*-)r*s\ aj 1: manifesting, exercising, or favoring rigor 
   : very strict  2: marked by extremes of temperature or climate : HARSH, 
   SEVERE  3: scrupulously accurate : PRECISE  - rig.or.ous.ly av