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arduous

American  
[ahr-joo-uhs, ahr-dyoo-] / ˈɑr dʒu əs, ˈɑr dyu- /

adjective

  1. requiring great exertion; laborious; difficult.

    an arduous undertaking.

    Synonyms:
    exhausting, burdensome, wearisome, onerous, toilsome, hard
    Antonyms:
    easy
  2. requiring or using much energy and vigor; strenuous.

    making an arduous effort.

  3. hard to climb; steep.

    an arduous path up the hill.

  4. hard to endure; full of hardships; severe.

    an arduous winter.


arduous British  
/ ˈɑːdjʊəs /

adjective

  1. requiring great physical or mental effort; difficult to accomplish; strenuous

  2. hard to endure; harsh

    arduous conditions

  3. hard to overcome or surmount; steep or difficult

    an arduous track

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • arduously adverb
  • arduousness noun
  • superarduous adjective
  • superarduously adverb
  • superarduousness noun
  • unarduous adjective
  • unarduously adverb
  • unarduousness noun

Etymology

Origin of arduous

First recorded in 1530–40; from Latin arduus “erect, laborious, steep”

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Meals feel less like a relaxing reprieve after long, arduous missions and more like a tension-filled calm before a storm you’re 100% certain is coming — and may very well take you with it.

From Salon

“The arduous reparation from the ravages of the pandemic are all but complete, with the shares now having exceeded the record highs achieved in 2018,” he said.

From The Wall Street Journal

Digitizing it and syncing it up with audio was an arduous slog.

From The Wall Street Journal

“You’re making this long, arduous journey, and when you get there, kind of by definition, there’s nothing.”

From The Wall Street Journal

Bondi slipped in the jab near the end of an arduous House hearing largely focused on the Department of Justice’s handling of the Jeffrey Epstein investigation.

From Los Angeles Times