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

Synonyms & Similar Words

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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

Synonyms & Similar Words

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 list takes months to compile, with multiple steps and checks designed to ensure the ranking is rigorous and consistent. — Kelli Grant, Cfp®,riley De León, CNBC, 8 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 Operating-model transformation requires both strategic vision and rigorous accountability, and only finance leaders sit at the intersection of both. — James Kavanaugh, Fortune, 30 Sep. 2026 But whether that passion requires taxpayers to subsidize new facilities every time leagues and franchises ask for them needs rigorous scrutiny. — Abigail Hall, The Conversation, 29 Sep. 2026 See All Example Sentences for rigorous

Recent Examples of Synonyms for rigorous

Adjective

Anthropic wants Congress to set strict limits on when federal authorities can stop advanced AI models from reaching users.

— Aamir Khollam, Interesting Engineering, 17 Oct. 2026
France, unlike the United States, places strict limits on campaign spending, but money still shapes the broader political ecosystem.

— Nicholas Bequelin, Time, 16 Oct. 2026

Definition of strict

Adjective

Moreover, the company says automatic workout recognition is twice as accurate as before, with 50% fewer missed activities.

— Andrew Gebhart, PC Magazine, 12 Oct. 2026
Google says the new model means auto activity tracking is twice as accurate and supports over 100 activities.

— Victoria Song, The Verge, 12 Oct. 2026

Definition of accurate

Adjective

Although sustainability has faced disruption and political backlash globally in recent years, and the European Union has delayed or rolled back some of its most stringent measures, the Digital Product Passport is set to become a reality in Europe.

— Martino Carrera, Footwear News, 9 Oct. 2026
The poisonings killed at least seven people and led to one of the largest pharmaceutical recalls ever, along with more stringent over-the-counter drug packaging.

— Bob Goldsborough, Chicago Tribune, 8 Oct. 2026

Definition of stringent

Adjective

The problem, Snegovaya said, is that achieving military autonomy for Europe and Ukraine is extremely difficult in the short term, and Europe has been slow to develop the necessary capabilities.

— Elsa Ohlen, CNBC, 17 Oct. 2026
Past changes have pushed the glacier into a retreat that may be difficult to reverse, while new modeling suggests scientists may have underestimated how warm seawater reaches beneath it.

— Kaif Shaikh, Interesting Engineering, 17 Oct. 2026

Definition of difficult

Adjective

Celebrity hairstylist Brian Magallones considers this the perfect balance between a not-too-fussy and not-too-structured chignon, a style that sounds tough to style without a professional team but is actually quite easy to master at-home.

— Kaleigh Werner, Footwear News, 13 Oct. 2026
Coming off that dominant performance against the Yankees, Rasmussen went six-plus tough innings.

— Rob Maaddi, Los Angeles Times, 13 Oct. 2026

Definition of tough

Adjective

But actually, the precise challenge was to not treat it as a joke.

— Annika Pham, Variety, 12 Oct. 2026
The smaller probe will then head toward the asteroid's surface, a descent that should take two to three hours depending on 269 Justitia's precise gravity, which remains unknown.

— Sharmila Kuthunur, Space.com, 12 Oct. 2026

Definition of precise

Adjective

As Hispanic Heritage Month continues, one musician at Philadelphia's Curtis Institute of Music is challenging expectations about classical music and the harp.

— Madeleine Wright, CBS News, 16 Oct. 2026
Naomi Ackie, who plays the scientist charged with Hagen’s experimental procedure, praised how her co-star shouldered what was a very challenging role.

— Chris Gardner, HollywoodReporter, 16 Oct. 2026

Definition of challenging

Adjective

And now those still left in the battered city along Ukraine's southeastern front face death from hunger or disease as another harsh winter looms, with no agreement in sight for even a humanitarian evacuation.

— ABC News, ABC News, 17 Oct. 2026
Despite low winds and little rain, harsh surf continues to wreak havoc along Southern California's coastal communities.

— Alicia Victoria Lozano, NBC news, 17 Oct. 2026

Definition of harsh

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“Rigorous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/rigorous. Accessed 19 Oct. 2026.

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Synonyms of rigorous

adjective

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