Etymology

laborious

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Today it means: Requiring much physical effort; toilsome. Full definition →

Old French laborios ← Latin laboriosus
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The story

  1. Latin · derived fromlaboriosus
  2. Old French · derived fromlaborios
  3. English todaylaborious

From Old French laborios, from Latin laboriosus. By surface analysis, labor + -ious

Etymology from Wiktionary, CC BY-SA 4.0.