Simple Definition of unflappable
: not easily upset : unusually calm in difficult situations
Examples of unflappable in a sentence
He has a reputation for being unflappable.
<the unflappable teacher never even blinked when the wall map came crashing down>
Origin and Etymology of unflappable
1un- + 1flap (state of excitement) + -able
First Known Use: 1954
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