Etymology

unfrivolous

U1N1F4R1I1V4O1L1O1U1S1

Today it means: Not frivolous Full definition →

English frivolous ← 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. Englishfrivolous
  9. English todayunfrivolous

From un- + frivolous.

Etymology from Wiktionary, CC BY-SA 4.0.