Etymology

unbelievably

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Today it means: In a manner that one does not or cannot believe. Full definition →

Proto-Germanic *līką ← Proto-Indo-European *leyg- ← English unbelievable
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The story

  1. Englishunbelievable
  2. Proto-Indo-European*leyg-
  3. Proto-Germanic*līką
  4. English todayunbelievably

From unbelievable + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.