/ flegˈmætɪk; NAmE / adjective
not easily made angry or upset
SYN calm :
a phlegmatic temperament
► phleg·mat·ic·al·ly / -kli; NAmE / adverb
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WORD ORIGIN
Middle English (in the sense relating to the humour phlegm ): from Old French fleumatique , via Latin from Greek phlegmatikos , from phlegma inflammation, from phlegein to burn.