Definition of rigorous adjective from the Oxford Advanced Learner's Dictionary

     

    rigorous

     adjective
    adjective
    BrE BrE//ˈrɪɡərəs//
     
    ; NAmE NAmE//ˈrɪɡərəs//
     
     
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  1. 1done carefully and with a lot of attention to detail synonym thorough a rigorous analysis Few people have gone into the topic in such rigorous detail. The second team adopted a much more rigorous approach to the problem.
  2. 2demanding that particular rules, processes, etc. are strictly followed synonym strict The work failed to meet their rigorous standards. They may benefit from the rigorous application of competition policy.
  3. Word Origin late Middle English: from Old French rigorous or late Latin rigorosus, from rigor ‘stiffness’, from rigere ‘be stiff’.
See the Oxford Advanced American Dictionary entry: rigorous