Definition of phlegmatic adjective from the Oxford Advanced Learner's Dictionary

 

phlegmatic

 adjective
adjective
BrE BrE//fleɡˈmætɪk//
 
; NAmE NAmE//fleɡˈmætɪk//
 
 
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not easily made angry or upset synonym calm a phlegmatic temperament 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’.
See the Oxford Advanced American Dictionary entry: phlegmatic