phlegmatic

adj.

[1]	phlegmatical , phlegmatical , stoic(al) , unemotional , unenthusiastic , unanimated , sluggish , apathetic , uninvolved , lethargic , unfeeling , uncaring , cold , unresponsive , stolid , unmoved , insensitive , unaffected , insensible , indifferent , unconcerned , uninterested , listless , torpid , indolent , inactive , passive , (Rare) hebetudinous
[2]	phlegmatical , self-possessed , self-controlled , controlled , restrained , composed , calm , serene , tranquil , placid , cool-headed , equanimous , cool , undisturbed , unperturbed , unruffled , imperturbable , even-tempered , philosophical , temperate , moderate