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 next

as in difficult

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

Synonyms & Similar Words

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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

Synonyms & Similar Words

Antonyms & Near Antonyms

Synonym Chooser

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 By then, the case had entered a final, arduous pretrial stage called summary judgment. —

Joe Mahr, Chicago Tribune, 29 Mar. 2026 Traversing the cave required an arduous effort by Pelley and the 60 Minutes team. —

Brit McCandless Farmer, CBS News, 29 Mar. 2026 The deal followed arduous bipartisan negotiations over the last six weeks. —

Marissa Martinez, NBC news, 27 Mar. 2026 Post-punk bands face few gauntlets as arduous as the slow song, and Landowner challenge themselves to traverse three of them. —

Nina Corcoran, Pitchfork, 24 Mar. 2026 See All Example Sentences for arduous

Recent Examples of Synonyms for arduous

Adjective

There were also high-arcing 3-pointers that touched nothing but the net, a difficult runner through contact that went in, and the kind of gravity that gave Kristaps Porzingis a layup just by cutting into space while the big man dove.

— Joseph Dycus, Mercury News, 6 Apr. 2026
Some things in life are difficult.

— Editorial, Boston Herald, 6 Apr. 2026