be unflappable ( synonym found)
Definition of be unflappable:

(adj) : remaining composed and levelheaded at all times; unswayed by adversity or excitement; impossible to fluster; not to get frustrated or irritated easily
Definition of be unflappable:

(adj) : remaining composed and levelheaded at all times; unswayed by adversity or excitement; impossible to fluster; not to get frustrated or irritated easily
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