Phlegmatic

[fleg-mat-ik] /flɛgˈmæt ɪk/

adjective
1.
not easily excited to action or display of emotion; apathetic; sluggish.
2.
self-possessed, calm, or composed.
3.
of the nature of or abounding in the humor .
/flɛɡˈmætɪk/
adjective
1.
having a stolid or unemotional disposition
2.
not easily excited
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. [John of Trevisa, translation of Bartholomew de Glanville’s “De proprietatibus rerum,” 1398]

phlegmatic phleg·mat·ic (flěg-māt’ĭk) or phleg·mat·i·cal (-ĭ-kəl)
adj.