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 Maybe Loathe, with their rigorous touring schedule, have chosen to optimize their songwriting for their live act. — Patrick Lyons, Pitchfork, 16 July 2026 Not all private schools are accredited and not all accrediting agencies are equally rigorous. — Mollie Simon, ProPublica, 16 July 2026 Any new toll roads would have to make practical sense and survive rigorous feasibility studies. — Scott Maxwell, The Orlando Sentinel, 10 July 2026 Funk was one of the Mercury 13, a group of women who successfully passed the same rigorous physiological exams as NASA astronauts in the early 1960s. — Michael Loria, USA Today, 10 July 2026 See All Example Sentences for rigorous

Recent Examples of Synonyms for rigorous

Adjective

Though South Florida abides by strict statewide building codes to protect against wind and flooding, Lejeune is concerned that no new construction has been tested by destructive storms.

— Jacqui Palumbo, CNN Money, 21 July 2026
In the 2026 session, the Legislature passed HB 991, an elections bill that requires strict proof of citizenship to vote and reduces the forms of photo ID that are acceptable at the polls.

— Eric "Doc" Stelnicki, Sun Sentinel, 20 July 2026

Definition of strict

Adjective

The combination of low-friction actuation, dual joint encoders and minimal backlash enables highly accurate motion control while providing continuous force feedback during manipulation.

— Jijo Malayil, Interesting Engineering, 20 July 2026
Steering is accurate without being particularly communicative, but that's perfectly appropriate for this car.

— New Atlas, New Atlas, 20 July 2026

Definition of accurate

Adjective

In past Ebola outbreaks, no such stringent travel restrictions were implemented, and the US repatriated eight cases for high-level care.

— Beth Mole, ArsTechnica, 14 July 2026
National parks have some of the most stringent rules against development under a 1916 law known as the Organic Act.

— ABC News, ABC News, 13 July 2026

Definition of stringent

Adjective

Unlike dogs, they cannot simply be taken on longer walks, often resist dietary changes, and can be difficult to medicate consistently, making GLP-1 therapies potentially attractive if clinical trials prove successful.

— Elsa Ohlen,Carolin Roth, CNBC, 18 July 2026
Their stories recount the devastation to homes and businesses, life in temporary shelters, and the difficult process of rebuilding or relocating.

— Michelle Oliva-Espinosa, Kansas City Star, 18 July 2026

Definition of difficult

Adjective

White, when give the chance, has displayed a diverse offensive game, a defensive bent and an ability to make tough shots.

— Barry Jackson, Miami Herald, 17 July 2026
The stakes for new avatar don’t feel quite as high—the specific circumstances around the former was a perfect storm that'll be tough to duplicate—but the music isn’t any less potent for it.

— Lawrence Burney, Pitchfork, 16 July 2026

Definition of tough

Adjective

Their ability to keep the ball away from opponents with their precise, pretty lpasses, before finding a cutting edge through Lamine Yamal or Mikel Oyarzabal, has been devastating to watch unfurl in this tournament.

— Kyle Feldscher, CNN Money, 16 July 2026
Syed Rizvi, the director of the Multiple Sclerosis Center of Rhode Island, who was not involved in this study, said the new findings help advance MS research toward more precise approaches.

— Lauren Chan, STAT, 15 July 2026

Definition of precise

Adjective

The method also relies on multiple Bell tests and assumptions about independent quantum sources, which could make large-scale implementation challenging.

— Rupendra Brahambhatt, Interesting Engineering, 18 July 2026
His 15-point first half Thursday included two threes, a high-degree-of-difficulty turnaround jumper and another challenging jumper.

— Barry Jackson, Miami Herald, 17 July 2026

Definition of challenging

Adjective

The couple made sure the design included a basement where the kids could spend time, better insulation to handle South Dakota’s harsh weather and plenty of storage — all features their previous home lacked.

— Tereza Shkurtaj, PEOPLE, 18 July 2026
Those are some of the harsh conditions that detainees in Immigration and Customs Enforcement custody described experiencing in recent weeks at the Federal Detention Center, a Bureau of Prisons facility located in a concrete tower in downtown Miami.

— Syra Ortiz Blanes, Miami Herald, 18 July 2026

Definition of harsh

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“Rigorous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/rigorous. Accessed 22 Jul. 2026.

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Synonyms of rigorous

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