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English definition of “rigorous”

rigorous

adjective uk   /ˈrɪɡ.ər.əs/ us    /-ɚ-/

rigorous adjective (CAREFUL)

approving careful to look at or consider every part of something to make certain it is correct or safe: rigorous testing/checking/methodsAccurate and exactCautious and vigilantPaying attention and being careful

rigorous adjective (SEVERE)

controlling behaviour in a severe way: the rigorous controls governing the sale of sharesComplicated and difficult to doDifficult to understand
rigorously
adverb uk   /-li/ us  
(Definition of rigorous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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