RIGOROUS Synonyms: 239 Similar and Opposite Words

Q: How is the word 'rigorous' distinct from other similar adjectives?

Some common synonyms of rigorous are rigid , strict , and stringent . While all these words mean "extremely severe or stern," rigorous implies the imposition of hardship and difficulty. // the rigorous training of recruits

Q: When can 'rigid' be used instead of 'rigorous'?

While in some cases nearly identical to rigorous , rigid implies uncompromising inflexibility. // rigid rules of conduct

Q: When would 'strict' be a good substitute for 'rigorous'?

Although the words strict and rigorous have much in common, strict emphasizes undeviating conformity to rules, standards, or requirements. // strict enforcement of the law

Q: When might 'stringent' be a better fit than 'rigorous'?

The synonyms stringent and rigorous are sometimes interchangeable, but stringent suggests severe, tight restriction or limitation. // stringent standards of admission

rigorous

adjective

ˈri-g(ə-)rəs

Definition of rigorous

as in strict

given to exacting standards of discipline and self-restraint a rigorous football coach who pushes his players to their physical and mental limits

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Antonyms & Near Antonyms

as in accurate

meeting the highest standard of accuracy a rigorous analysis of the data

Synonyms & Similar Words

Antonyms & Near Antonyms

as in stringent

not allowing for any exceptions or loosening of standards a rigorous diet and exercise regimen

Synonyms & Similar Words

Antonyms & Near Antonyms

as in difficult

requiring considerable physical or mental effort studied for umpteen months for the rigorous exam

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Antonyms & Near Antonyms

Synonym Chooser

How is the word rigorous distinct from other similar adjectives?

Some common synonyms of rigorous are rigid, strict, and stringent. While all these words mean "extremely severe or stern," rigorous implies the imposition of hardship and difficulty.

the rigorous training of recruits

When can rigid be used instead of rigorous?

While in some cases nearly identical to rigorous, rigid implies uncompromising inflexibility.

rigid rules of conduct

When would strict be a good substitute for rigorous?

Although the words strict and rigorous have much in common, strict emphasizes undeviating conformity to rules, standards, or requirements.

strict enforcement of the law

When might stringent be a better fit than rigorous?

The synonyms stringent and rigorous are sometimes interchangeable, but stringent suggests severe, tight restriction or limitation.

stringent standards of admission

Example Sentences

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.

Recent Examples of rigorous The whole piece is about the free and rigorous interplay of line. — Zachary Fine, New Yorker, 14 Oct. 2026 All ‘60 Minutes’ pieces go through a famously rigorous editorial process — which includes edits from editors. — Todd Spangler, Variety, 13 Oct. 2026 This requires rigorous testing, design, model explainability measures and secure data architectures. — Jennifer C. Wolfe, Forbes.com, 13 Oct. 2026 With rigorous reporting and more than 150 interviews with those working for the US’ most influential AI companies, technology journalist Roose covers Silicon Valley’s breakneck race to build artificial general intelligence. — Mary Lawrence Ware, semafor.com, 6 Oct. 2026 See All Example Sentences for rigorous

Recent Examples of Synonyms for rigorous

Adjective

Catholics have used Scripture to argue for and against deportations and strict immigration enforcement.

— Andrew J. Campa, Los Angeles Times, 25 Oct. 2026
But the country also has strict rules governing how minors should be treated during a criminal investigation.

— Hanako Montgomery, CNN Money, 24 Oct. 2026

Definition of strict

Adjective

Biggs has accused the Hobbs administration of driving up home prices with stringent water requirements that stalled new buildings in parts of the Phoenix area.

— Hannah Knowles The Washington Post, Arkansas Online, 19 Oct. 2026
The riskiest part, for a company with universally stringent expectations, was hiring.

— Gideon Lewis-Kraus, New Yorker, 19 Oct. 2026

Definition of stringent

Adjective

Jarman, who came in as the defending champion on the event, put together a more difficult routine but was nicked by judges for his execution.

— ABC News, ABC News, 24 Oct. 2026
This is the last remaining game on the schedule that should be very difficult.

— David Troy OutKick, FOXNews.com, 24 Oct. 2026

Definition of difficult

Adjective

The case has led to calls for tougher oversight of churches and other religious organizations in a country where religious faith plays a prominent role in public life.

— Jefferson Kahinju Reuters, Arkansas Online, 20 Oct. 2026
Thermal equilibrium might sound like a tough concept, but hundreds of systems reach them around us on a daily basis.

— Ameya Paleja, Interesting Engineering, 20 Oct. 2026

Definition of tough

Adjective

The reference point is 1930s Milan, where bold material combinations and precise geometry turned these utilitarian spaces into showpieces.

— Kristen Flanagan, Architectural Digest, 26 Oct. 2026
And the need to blend all the sound together right before the ear canal can make the more complex instrumentation sound more sloppy than precise.

— Mark Knapp, PC Magazine, 24 Oct. 2026

Definition of precise

Adjective

Such calculations are part of a wider effort to understand why molecular simulations remain challenging.

— Rupendra Brahambhatt, Interesting Engineering, 24 Oct. 2026
But the shift in college athletics has required an internal reconciling that is even more challenging than the external education.

— Dana O’Neil, CNN Money, 24 Oct. 2026

Definition of challenging

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Style

“Rigorous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/rigorous. Accessed 27 Oct. 2026.

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Synonyms of rigorous

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