Etymology

monotonous

mo·no·ton·ous
M3O1N1O1T1O1N1O1U1S1

Today it means: Having an unvarying pitch or tone. Full definition →

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

  1. Englishmonotone
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. English todaymonotonous

From monotone + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.