Etymology

unprofessional

U1N1P3R1O1F4E1S1S1I1O1N1A1L1

Today it means: Unbecoming of a professional; hence inappropriate in the workplace. Full definition →

English professional ← 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. Englishprofessional
  9. English todayunprofessional

From un- + professional.

Etymology from Wiktionary, CC BY-SA 4.0.