Etymology

ungrammatical

U1N1G2R1A1M3M3A1T1I1C3A1L1

Today it means: In violation of one or more of the rules and conventions of a language as defined by the grammar, resulting in unacceptable or incorrect usage. Full definition →

English grammatical ← 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. Englishgrammatical
  9. English todayungrammatical

From un- + grammatical.

Etymology from Wiktionary, CC BY-SA 4.0.