Arduous Definition

Demanding great effort or labor; difficult.
American Heritage
Difficult to do; laborious; onerous.
Webster's New World
Testing severely the powers of endurance; strenuous.
A long, arduous, and exhausting war.
American Heritage
Using much energy; strenuous.
Webster's New World
Hard to traverse, climb, or surmount.
American Heritage

Origin of Arduous

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

    From Wiktionary

  • From Latin arduus high, steep

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

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