Etymology

unsuccessful

un·suc·cess·ful
U1N1S1U1C3C3E1S1S1F4U1L1

Today it means: Failed, not successful. Full definition →

English successful ← 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. Englishsuccessful
  9. English todayunsuccessful

From un- + successful.

Etymology from Wiktionary, CC BY-SA 4.0.