Arduous definition

ärjo͝o-əs
Using much energy; strenuous.
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Demanding great effort or labor; difficult.
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Hard to traverse, climb, or surmount.
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Testing severely the powers of endurance; strenuous.

A long, arduous, and exhausting war.

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Difficult to do; laborious; onerous.
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Steep; hard to climb.
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Arduous is defined as a sharp, high climb where reaching the top is a challenge.

Mt. Everest is an example of an arduous incline.

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The definition of arduous is a way of describing something that is extremely tiring and difficult.

The John Beargrease Sled Dog Marathon is an example of an arduous race.

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Needing or using up much energy; testing powers of endurance.

The movement towards a peaceful settlement has been a long and arduous political struggle.

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Origin of arduous

  • From Latin arduus high, steep

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin arduus (“lofty, high, steep, hard to reach, difficult, laborious”), akin to Irish ard (“high”).

    From Wiktionary