hard to upset; imperturbable; calm; composed
WordReference Random House Learner's Dictionary of American English © 2025
un•flap•pa•ble /ʌnˈflæpəbəl/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2025- not easily upset or confused, esp. in a crisis.
un•flap•pa•ble
(un flap′ə bəl),USA pronunciation adj.
un•flap′pa•bil′i•ty, n.
un•flap′pa•bly, adv.
- not easily upset or confused, esp. in a crisis;
imperturbable.
- un-1 + flap + -able 1950–55
un•flap′pa•bly, adv.
Collins Concise English Dictionary © HarperCollins Publishers::
'unflappable' also found in these entries (note: many are not synonyms or translations):