Etymology

informally

I1N1F4O1R1M3A1L1L1Y4

Today it means: In an irregular or informal manner; without the usual forms. Full definition →

Proto-Germanic *līką ← Proto-Indo-European *leyg- ← English informal
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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. Englishin-
  7. Englishformal
  8. Englishinformal
  9. Proto-Indo-European*leyg-
  10. Proto-Germanic*līką
  11. English todayinformally

From informal + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.