imperturbation

[ im-per-ter-bey-shuh n ]
/ ˌɪm pər tərˈbeɪ ʃən /

noun

freedom from perturbation; tranquillity; calmness.

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Origin of imperturbation

First recorded in 1640–50, imperturbation is from the Late Latin word imperturbātiōn- (stem of imperturbātiō). See im-2, perturbation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020