ONEROUS Synonyms: 109 Similar and Opposite Words

Q: How does the adjective 'onerous' contrast with its synonyms?

Some common synonyms of onerous are burdensome , exacting , and oppressive . While all these words mean "imposing hardship," onerous stresses being laborious and heavy especially because distasteful. // the onerous task of cleaning up the mess

Q: In what contexts can 'burdensome' take the place of 'onerous'?

The synonyms burdensome and onerous are sometimes interchangeable, but burdensome suggests causing mental as well as physical strain. // burdensome responsibilities

Q: Where would 'exacting' be a reasonable alternative to 'onerous'?

While the synonyms exacting and onerous are close in meaning, exacting implies rigor or sternness rather than tyranny or injustice in the demands made or in the one demanding. // an exacting employer

Q: When might 'oppressive' be a better fit than 'onerous'?

In some situations, the words oppressive and onerous are roughly equivalent. However, oppressive implies extreme harshness or severity in what is imposed. // the oppressive tyranny of a police state

onerous

adjective

ˈä-nə-rəs

Definition of onerous

as in tough

difficult to endure had the onerous and stressful job of notifying the families of soldiers killed in action

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in challenging

requiring much time, effort, or careful attention building the scale model of the frigate was an onerous task

Synonyms & Similar Words

Antonyms & Near Antonyms

Synonym Chooser

How does the adjective onerous contrast with its synonyms?

Some common synonyms of onerous are burdensome, exacting, and oppressive. While all these words mean "imposing hardship," onerous stresses being laborious and heavy especially because distasteful.

the onerous task of cleaning up the mess

In what contexts can burdensome take the place of onerous?

The synonyms burdensome and onerous are sometimes interchangeable, but burdensome suggests causing mental as well as physical strain.

burdensome responsibilities

Where would exacting be a reasonable alternative to onerous?

While the synonyms exacting and onerous are close in meaning, exacting implies rigor or sternness rather than tyranny or injustice in the demands made or in the one demanding.

an exacting employer

When might oppressive be a better fit than onerous?

In some situations, the words oppressive and onerous are roughly equivalent. However, oppressive implies extreme harshness or severity in what is imposed.

the oppressive tyranny of a police state

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 onerous Since some users were reporting that the time taken for the new indexing was more than a week, as mentioned above, a light preparation now sounds much less onerous, or even noticeable. — David Phelan, Forbes.com, 29 July 2026 Even automakers who will be footing the bill were on board with the new law, which is less onerous for them than a similar law in the European Union. — Camila Domonoske, NPR, 13 July 2026 In 2022, a Humans of New York post revealed that Rinaldi sells his sperm directly to prospective parents who are seeking to avoid the onerous costs of sperm banks and fertility treatments. — Joseph Konig, PEOPLE, 25 June 2026 State lawmakers have stepped back from earlier, wider-ranging attempts to regulate AI that were vetoed or otherwise derailed by governors who viewed the measures as too onerous toward the industry’s development, including efforts to hold developers accountable for bias in AI systems. — Marc Levy, Los Angeles Times, 21 June 2026 See All Example Sentences for onerous

Recent Examples of Synonyms for onerous

Adjective

The war, and in particular Iran’s direct targeting of the Gulf, makes this approach a tough pill to swallow.

— Dina Esfandiary, Foreign Affairs, 27 Aug. 2026
The conversation shifted from tougher ordinances toward resource allocation and investing in third spaces, which are places outside of work, school or home.

— Charlotte Observer, Charlotte Observer, 27 Aug. 2026

Definition of tough

Adjective

For the healthcare providers in attendance, the party — which featured games and activities for the kids — is a chance to see the real-life impact of their often emotionally challenging work.

— Toria Sheffield, PEOPLE, 29 Aug. 2026
Because of the challenging terrain, the bridges are designed to be constructed without heavy machinery.

— Fatma Tanis, NPR, 29 Aug. 2026

Definition of challenging

Adjective

Scott London Every year, Black Rock City appears on a dry lakebed in one of Nevada’s harshest areas, then disappears just as fast.

— Jim Dobson, Forbes.com, 29 Aug. 2026
Hig has bunkered down with a grouchy companion, Bangley (Josh Brolin), who thrives in this harsh world.

— Amy Nicholson, Los Angeles Times, 28 Aug. 2026

Definition of harsh

Adjective

The losses linked to the demise of these groups are difficult to quantify, but participants and advocates say the impacts will reverberate across federal agencies for years.

— Katia Riddle, NPR, 29 Aug. 2026
Ground surveys can provide more detailed information at a particular site, but covering an entire subway corridor that way would be difficult.

— Rupendra Brahambhatt, Interesting Engineering, 29 Aug. 2026

Definition of difficult

Adjective

Among those waiting to meet the president was Leon Czolgosz, a 28-year-old anarchist who considered the government oppressive.

— Encyclopedia Britannica, Encyclopedia Britannica, 28 Aug. 2026
People seem to be craving the scent of something cooling and quenching, an olfactive promise that less oppressive weather lies ahead.

— April Long, Allure, 27 Aug. 2026

Definition of oppressive

Adjective

Leaders may not need to tax themselves heavily to gain some cognitive benefit during an already demanding period.

— Julian Hayes II, Forbes.com, 29 Aug. 2026
That makes both the X-ray measurement itself and the interpretation of its data increasingly demanding.

— Aamir Khollam, Interesting Engineering, 28 Aug. 2026

Definition of demanding

Adjective

Even with no rate increase, though, Tulsa electric bills would be spiking this year because of searing summer heat, with more than twice the average number of triple-digit days.

— Scott Horsley, NPR, 26 Aug. 2026
Clock hands circle predictably and calendar pages turn on schedule, but internally, within our bodies, minds and hearts, time is a whole different thing — discontinuous, wondrous, searing.

— Leah Ollman, Los Angeles Times, 25 Aug. 2026

Definition of searing

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onerous

ones

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“Onerous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/onerous. Accessed 2 Sep. 2026.

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