rigorous

adjective

rig·​or·​ous ˈri-g(ə-)rəs How to pronounce rigorous (audio)
1
: manifesting, exercising, or favoring rigor : very strict
2
a
: marked by extremes of temperature or climate
b
3
: scrupulously accurate : precise
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.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Ozzy Osbourne shared 3 children with first wife Thelma Riley The father of six children over two marriages, Osbourne has been vocal about how rigorous touring and alcohol use affected his family life. Anna Kaufman, USA Today, 23 July 2025 The 22-year-old flew to the United States and went through the DCC’s rigorous tryouts, eventually becoming one of six new rookies to join the 36-member squad, out of thousands who auditioned. Sean Neumann, People.com, 22 July 2025 That testing process was rather rigorous for a few reasons. Monisha Ravisetti, Space.com, 15 July 2025 Of course, few patients can conduct the sort of rigorous self-study that Fajgenbaum did, and pharmaceutical companies have little incentive to find novel uses for old drugs, which bring in little money. Dhruv Khullar, New Yorker, 15 July 2025 See All Example Sentences for rigorous

Word History

First Known Use

15th century, in the meaning defined at sense 1

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

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Cite this Entry

“Rigorous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rigorous. Accessed 29 Jul. 2025.

Kids Definition

rigorous

adjective
rig·​or·​ous ˈrig-(ə-)rəs How to pronounce rigorous (audio)
1
: very strict
2
: marked by great differences of temperature or climate
3
: very accurate
rigorously adverb
rigorousness noun

More from Merriam-Webster on rigorous

Last Updated: - Updated example sentences
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