Answer: COOLHEADED

AnswerCrossword Clue
COOLHEADEDUnflappable
COOLHEADEDGood under pressure
COOLHEADEDCalm and collected.
COOLHEADEDCalm
COOLHEADEDSedate
coolheadednot easily excited
coolheadedNot easily worried or excited