imperturbability means A state of calm, unruffled self-assurance; aplomb, composure.
Why “imperturbability” is a great word
A state of calm, unruffled self-assurance and composure, especially in the face of disturbance. From the English prefix im- ("not") + perturbability, itself from Late Latin imperturbabilis, from Latin in- ("not") + perturbare ("to throw into confusion"). Unlike aplomb, which suggests a confident, often social poise, or stoicism, which refers to a philosophical endurance of pain, imperturbability is the specific quality of an inner stillness that simply cannot be agitated. It is the surgeon's hands steady at the moment of unexpected bleeding, the unblinking eye of a ship's captain in a gale, the deep silence at the center of a roaring storm—the profound quiet that remains when everything else has been shouted down, a refusal to be thrown into confusion that borders on the inhuman.
Etymology
From im- + perturbability.
noun
- A state of calm, unruffled self-assurance; aplomb, composure.
Definitions & examples from Wiktionary (CC BY-SA 3.0).
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