ARDUOUS Synonyms: 106 Similar and Opposite Words

Q: How is the word 'arduous' different from other adjectives like it?

The words difficult and hard are common synonyms of arduous . While all three words mean "demanding great exertion or effort," arduous stresses the need of laborious and persevering exertion. // the arduous task of rebuilding

Q: When could 'difficult' be used to replace 'arduous'?

While in some cases nearly identical to arduous , difficult implies the presence of obstacles to be surmounted or puzzles to be resolved and suggests the need of skill or courage. // the difficult ascent of the mountain

Q: When is it sensible to use 'hard' instead of 'arduous'?

The synonyms hard and arduous are sometimes interchangeable, but hard implies the opposite of all that is easy. // farming is hard work

arduous

adjective

ˈär-jə-wəs

Definition of arduous

as in difficult

requiring considerable physical or mental effort climbing Mount Everest is an arduous, exhausting challenge

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Antonyms & Near Antonyms

as in challenging

requiring much time, effort, or careful attention the arduous task of doing the research for my term paper

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Antonyms & Near Antonyms

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How is the word arduous different from other adjectives like it?

The words difficult and hard are common synonyms of arduous. While all three words mean "demanding great exertion or effort," arduous stresses the need of laborious and persevering exertion.

the arduous task of rebuilding

When could difficult be used to replace arduous?

While in some cases nearly identical to arduous, difficult implies the presence of obstacles to be surmounted or puzzles to be resolved and suggests the need of skill or courage.

the difficult ascent of the mountain

When is it sensible to use hard instead of arduous?

The synonyms hard and arduous are sometimes interchangeable, but hard implies the opposite of all that is easy.

farming is hard work

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 arduous Matthew faces arduous health struggles and numerous developmental challenges. — Angie Leventis Lourgos, Chicago Tribune, 22 Aug. 2026 That’s all Mensah has been trying to be since enrolling at Miami in January following a lengthy and arduous process to officially transfer. — Jordan McPherson, Miami Herald, 22 Aug. 2026 Even the smallest household and personal tasks have become arduous and time-consuming. — Joshua Rothman, New Yorker, 21 Aug. 2026 But gathering the real-world human data necessary to win Food and Drug Administration approval for drugs, devices and other interventions can be an arduous task. — Michelle Andrews, USA Today, 15 Aug. 2026 See All Example Sentences for arduous

Recent Examples of Synonyms for arduous

Adjective

Being undefeated after a trio of difficult opening matches can only be seen as a positive, even if Newcastle’s obvious shortcomings require addressing if that run is to be prolonged.

— Chris Waugh, New York Times, 6 Sep. 2026
Engineers need flight data on propulsion, aerodynamics, thermal management, guidance and other subsystems under conditions that are difficult to reproduce on the ground.

— Bojan Stojkovski, Interesting Engineering, 6 Sep. 2026

Definition of difficult

Adjective

Eric Loucks, the director of the Mindfulness Center at Brown, pointed out that a person can have a challenging experience during meditation and still find their overall meditation practice to be beneficial.

— Olga Khazan, The Atlantic, 4 Sep. 2026
For something more hands-on, Atlanta Motorsports Park in Dawsonville has a challenging kart circuit where karts can reach 50 mph or more.

— Chris Teague, AJC.com, 4 Sep. 2026

Definition of challenging

Adjective

Space-grade electronics will cost more, and the ball’s shell—made from a material tough enough to roll over steel shards and withstand minus 184 °C temperatures—has never been evaluated in lunar extremes.

— IEEE Spectrum, IEEE Spectrum, 3 Sep. 2026
Democratic leaders face tough decisions on where to spend limited party resources to win the Senate majority.

— Burgess Everett, semafor.com, 3 Sep. 2026

Definition of tough

Adjective

That night, somewhere between a racist stranger, a free dessert, my girlfriend publicly shaming a man in a Mediterranean restaurant and our demanding cat, the City of Angels started to feel like home.

— Mayur Chauhan, Los Angeles Times, 4 Sep. 2026
And the longer or more demanding the workout, the more important such fuel becomes.

— Daryl Austin, USA Today, 2 Sep. 2026

Definition of demanding

Adjective

Seager's team is providing the AFN, along with their ongoing, rigorous science preparation.

— Leonard David, Space.com, 3 Sep. 2026
The 2022 Nature Biotechnology review urged rigorous clinical testing, and later reviews continued to flag reliability and standardization issues.

— Hanna Wickes, Charlotte Observer, 2 Sep. 2026

Definition of rigorous

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arduously

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“Arduous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/arduous. Accessed 7 Sep. 2026.

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Synonyms of arduous

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