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Added 9 October 2026

unflappable

/ʌnˈflæpəbəl/ adjective

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about unflappable 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

From un- + flap (“to upset, stir”) + -able.

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

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