Unflappable

//ʌnˈflæpəbəl// adj

Definitions

Adjective
  1. 1
    Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily.

    "The whole thing looked remarkably like an implacable force meeting an unflappable object."

Adjective
  1. 1
    not easily perturbed or excited or upset; marked by extreme calm and composure wordnet

Etymology

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

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