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Added 9 October 2026

imperturbable

/ˌɪmpəˈtɜːbəbl̩/ adjective

In Latin: imperturbābilis Wiktionary

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about imperturbable at Wordnik → Where our words come from →

Not easily perturbed or excited or upset; marked by extreme calm and composure.
hitherto imperturbable, he now showed signs of alarm

Origin

PIE word *né From Late Middle English imperturbable (“undisturbed; impossible to disturb”), borrowed from Late Latin imperturbābilis, from Latin im- (variant of in- (prefix meaning ‘not’)) + Late Latin perturbabilis (“perturbable”) (from Latin perturbō (“to confuse; to alarm, disturb, trouble, perturb”) + -bilis (suffix forming adjectives denoting a capacity or worth of being acted upon)).

From Wiktionary, via Kaikki.org (CC BY-SA)

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