Etymology

arduous

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Today it means: Needing or using up much energy; testing powers of endurance. Full definition →

Latin arduus
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The story

  1. Latin · derived fromarduus“lofty, high, steep, hard to reach, difficult, laborious”
  2. English todayarduous

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

Etymology from Wiktionary, CC BY-SA 4.0.