imperturbation

[im-per-ter-bey-shuh n]

noun

freedom from perturbation; tranquillity; calmness.

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. 2019