not easily excited to action or display of emotion; apathetic; sluggish.
self-possessed, calm, or composed.
of the nature of or abounding in the humor phlegm.
Also, phlegmatical.

1300–50; < Late Latin phlegmaticus < Greek phlegmatikós pertaining to phlegm, equivalent to phlegmat- (stem of phlégma phlegm) + -ikos -ic; replacing Middle English fleumatik < Middle French fleumatique < Late Latin, as above

phlegmatically, adverb
phlegmaticalness, phlegmaticness, noun
unphlegmatic, adjective
unphlegmatical, adjective
unphlegmatically, adverb

1. stoical, cool, cold, uninterested, dull, torpid. 2. cool, collected, unruffled, placid, quiet. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phlegmatic or phlegmatical (flɛɡˈmætɪk)
1.  having a stolid or unemotional disposition
2.  not easily excited
phlegmatical or phlegmatical
phleg'matically or phlegmatical
phleg'maticalness or phlegmatical
phleg'maticness or phlegmatical

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"cool, calm, self-possessed," and in a more pejorative sense, "cold, dull, apathetic," 1570s, from lit. sense "abounding in phlegm (as a bodily humor)" (mid-14c.), from O.Fr. fleumatique, from L.L. phlegmaticus, from Gk. phlegmatikos "abounding in phlegm" (see phlegm).
"A verry flewmatike man is in the body lustles, heuy and slow." [John of Trevisa, transl. of Bartholomew de Glanville's "De proprietatibus rerum," 1398]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

  1. Of or relating to phlegm.

  2. Having or suggesting a calm, sluggish temperament; unemotional.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In fact, his writing is nearly as phlegmatic as the methodical, unrattled
He was calm, almost phlegmatic in conversation, but the minute he walked on a
  platform he was transformed.
We are said to be the most phlegmatic and unemotional of peoples.
Corpulence makes a man reasonable, pleasant and phlegmatic.
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