Extremely thorough and careful: ‘the rigorous testing of consumer products’
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Synonyms
1.1(Of a rule, system, etc.) strictly applied or adhered to: ‘rigorous controls on mergers’
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1.2(Of a person) adhering strictly to a belief or system: ‘a rigorous teetotaller’
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1.3Harsh and demanding: ‘many of the expedition had passed rigorous SAS courses’