Unflappable Definition

ŭn-flăpə-bəl
adjective
Not easily excited or disconcerted; imperturbable; calm.
Webster's New World

Remaining composed and level-headed at all times; unswayed by adversity or excitement; impossible to fluster; not becoming frustrated or irritated easily. [1954 to date]

Wiktionary
Antonyms:

Origin of Unflappable

  • un- +"Ž flap (“upset, stir, scandal, controversy") +"Ž -able

    From Wiktionary

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unflappable