Etymology

rigorous

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Today it means: Showing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough. Full definition →

Middle English rigorous ← Anglo-Norman rigoreus ← Late Latin rigōrōsus
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The story

  1. Late Latin · derived fromrigōrōsus
  2. Anglo-Norman · derived fromrigoreus
  3. Middle English · inherited fromrigorous
  4. English todayrigorous

Inherited from Middle English rigorous, from Middle French and Anglo-Norman rigoreus, derived from Late Latin rigōrōsus (stiff, rigid; inflexible). By surface analysis, rigor + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.