rig·​or·​ous | \ ˈri-g(ə-)rəs How to pronounce rigorous (audio) \

Definition of rigorous

1 : manifesting, exercising, or favoring rigor : very strict
2a : marked by extremes of temperature or climate
b : harsh, severe
3 : scrupulously accurate : precise

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Other Words from rigorous

rigorously adverb
rigorousness noun

Choose the Right Synonym for rigorous

rigid, rigorous, strict, stringent mean extremely severe or stern. rigid implies uncompromising inflexibility. rigid rules of conduct rigorous implies the imposition of hardship and difficulty. the rigorous training of recruits strict emphasizes undeviating conformity to rules, standards, or requirements. strict enforcement of the law stringent suggests severe, tight restriction or limitation. stringent standards of admission

Examples of rigorous in a Sentence

rigorous enforcement of the rules a rigorous course of study We subjected the data to a rigorous analysis.
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Recent Examples on the Web The longest-lasting effect, however, may be on the FDA’s reputation for imposing rigorous safety and efficacy standards. Michael Hiltzik, Los Angeles Times, 17 June 2021 New organizations such as the American Association for the Advancement of Science began applying rigorous standards to scientific discourse. Jeremy Mccarter, WSJ, 11 June 2021 ServiceNow has a rigorous process for delivering on the results its promises to achieve. Peter Cohan, Forbes, 2 June 2021 The department also holds a rigorous selection process, Brown said. Washington Post, 16 May 2021 There are many important questions to be answered about the role that social media now plays in our lives, which require careful thought and rigorous debate. The Editors, National Review, 6 May 2021 Those vaccines still went through a rigorous three-phase process, but in the meantime, those companies could scale up their processing plants and distribution plans. Andy Larsen, The Salt Lake Tribune, 30 Apr. 2021 Waggoner, Smitherman, and Singleton bumped fists-- a celebratory end to a rigorous vetting process that could signal another victory for lawmakers who have long pushed to ease alcohol restrictions. al, 30 Apr. 2021 Jones and Cruz underwent a rigorous interview process before they were selected for the six-week undertaking. BostonGlobe.com, 25 Apr. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rigorous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of rigorous

15th century, in the meaning defined at sense 1

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Time Traveler for rigorous

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The first known use of rigorous was in the 15th century

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Dictionary Entries Near rigorous



rigor mortis





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Last Updated

24 Jun 2021

Cite this Entry

“Rigorous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rigorous. Accessed 25 Jun. 2021.

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More Definitions for rigorous



English Language Learners Definition of rigorous

: very strict and demanding
: done carefully and with a lot of attention to detail
: difficult to endure because of extreme conditions


rig·​or·​ous | \ ˈri-gə-rəs How to pronounce rigorous (audio) \

Kids Definition of rigorous

1 : very strict rigorous rules
2 : hard to endure because of extreme conditions : harsh rigorous winters

Other Words from rigorous

rigorously adverb

More from Merriam-Webster on rigorous

Nglish: Translation of rigorous for Spanish Speakers

Britannica English: Translation of rigorous for Arabic Speakers


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