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English definition of “rigorous”

rigorous

adjective (SEVERE)    /ˈrɪɡ.ər.əs/ US  /-ɚ-/
controlling behaviour in a severe way: the rigorous controls governing the sale of sharesComplicated and difficult to doDifficult to understand rigorously     /-li/ adverb
(Definition of rigorous adjective (SEVERE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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