Etymology

harmonious

har·mo·ni·ous
H4A1R1M3O1N1I1O1U1S1

Today it means: Showing accord in feeling or action. Full definition →

Middle French harmonieux
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The story

  1. Middle French · borrowed fromharmonieux
  2. English todayharmonious

From Middle French harmonieux; by surface analysis, harmony + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.