Etymology

thunderous

T1H4U1N1D2E1R1O1U1S1

Today it means: Very loud; that sounds like thunder; thundersome. Also in metaphorical expressions, signifying fury. Full definition →

Proto-Indo-European *h₃édosder.? ← English thunder
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The story

  1. Englishthunder
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. English todaythunderous

From thunder + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.