Etymology

imperturbability

Today it means: A state of calm, unruffled self-assurance; aplomb, composure. Full definition →

English perturbability ← Middle English in- ← Latin in-
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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. Englishim-
  7. Englishperturbability
  8. English todayimperturbability

From im- + perturbability.

Etymology from Wiktionary, CC BY-SA 4.0.