Etymology

unserious

U1N1S1E1R1I1O1U1S1

Today it means: Characterized by a lack of seriousness (e.g., earnestness, commitment). Full definition →

English serious ← Middle English un- ← Old English un-
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Germanic*un-
  4. Proto-West Germanic*un-
  5. Old Englishun-
  6. Middle Englishun-
  7. Englishun-
  8. Englishserious
  9. English todayunserious

From un- + serious.

Etymology from Wiktionary, CC BY-SA 4.0.