Unflappable definitions

ŭn-flăp'ə-bəl
Persistently calm, whether when facing difficulties or experiencing success; not easily upset or excited.
adjective
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Not easily excited or disconcerted; imperturbable; calm.
adjective
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The definition of unflappable is not easily flustered.

When you can deal with an unexpected storm and the caterer not showing up on your wedding day without getting upset, this is an example of when you would be described as unflappable.

adjective
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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]
adjective
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Origin of unflappable

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