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phlegmatic (adj.)

"cool, calm, self-possessed," and in a more pejorative sense, "cold, dull, apathetic," 1570s, from literal sense "abounding in phlegm (as a bodily humor)" (mid-14c., fleumatik), from Old French fleumatique (13c., Modern French flegmatique), from Late Latin phlegmaticus, from Greek phlegmatikos "abounding in phlegm" (see phlegm).

A verry flewmatike man is in the body lustles, heuy and slow. [Bartholomew Glanville, c. 1360, "De proprietatibus rerum," translated by John of Trevisa]