Etymology

illogical

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Today it means: Contrary to logic; lacking sense or sound reasoning. Full definition →

English logical ← Middle English in- ← Latin in-
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The story

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinin-
  5. Middle Englishin-
  6. Englishil-
  7. Englishlogical
  8. English todayillogical

From il- + logical.

Etymology from Wiktionary, CC BY-SA 4.0.