phlegmatic

phlegmatic adjective aloof, apathetic, bloodless, bovine, callous, calm, cold, comatose, cool, detached, disinterested, dispassionate, distant, dull, frigid, halfhearted, hebetudinous, impassive, imperturbable, indifferent, inert, insensible, lackadaisical, languid, languorous, lazy, lentus, lethargic, lethargical, lifeless, listless, oscitant, passionless, passive, phlegmatical, pluckless, sedate, serene, slow, sluggish, sober, spiritless, staid, stoical, stolid, stony, stupefied, supine, tame, tardus, torpid, unagitated, unanxious, uncaring, uncommunicative, unconcerned, undisturbed, unemotional, unexcitable, unexcited, unfeeling, unflustered, unimpassioned, unperturbed, unruffled, unsusceptible, untroubled, unworried

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See also: dispassionate, indolent, languid, lifeless, obtuse, otiose, passive, stagnant, torpid