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 next

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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as in accurate

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

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as in stringent

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

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as in difficult

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

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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 General Manager Chuck Sundstrom, a lifelong racer, oversees operations, emphasizing rigorous tracking of each vehicle. —

Kristin Shaw, Forbes.com, 14 May 2026 Cleanup and ongoing monitoring must meet rigorous state and federal standards, be transparently communicated, and designed for long-term resilience in a neighborhood already facing flooding risks and climate pressures. —

Michelle De La Uz, New York Daily News, 13 May 2026 Viewers will witness Haaland’s rigorous training regime, deep connection to his roots and the emotional highs and lows of the tournament grind – thirty years after his father helped carry the nation to the 1994 tournament. —

Todd Spangler, Variety, 13 May 2026 The for-profit free-for-all with ketamine clinics has left consumers to navigate a vast marketplace where not all providers follow rigorous protocols. —

Lisa Jarvis, Twin Cities, 13 May 2026 See All Example Sentences for rigorous

Recent Examples of Synonyms for rigorous

Adjective

If strict fidelity gets in the way, it can be treated as immaterial.

— Literary Hub, Literary Hub, 19 May 2026
Employees who once rejected office culture are now returning to in-person roles, accepting stricter employer demands, delaying entrepreneurial goals, or remaining in emotionally exhausting workplaces because financial risks feel too high.

— Maia Niguel Hoskin, Forbes.com, 18 May 2026

Definition of strict

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“Rigorous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/rigorous. Accessed 20 May. 2026.

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Synonyms of rigorous

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