Answer: phlegmatic

AnswerCrossword Clue
PHLEGMATICUnruffled
PHLEGMATICImperturbable.
PHLEGMATICImpassive
phlegmaticnot easily excited to action or display of emotion.
phlegmaticof a calm, unexcitable disposition also PHLEGMATICAL
phlegmaticunemotional or unenthusiastic