Synonyms of phlegmatic

1 Syllable

slow, numb, cool, cold, flat, stoic, dull, blah

2 Syllables

frigid, slowest, languid, snoozy, mopish, groggy, mooney, sluggish, slower, inert, stretchy, listless, deadpan, stolid, stoical

3 Syllables

unsocial, incurious, passionless, uncurious, lifeless, lymphatic, serene, languorous, lethargic, sleepyhead, passive, fatheaded, unfeeling

4 Syllables

unaroused, unimpressed, unbothered, unreactive, impassive, indifferent, sleepyheaded, apathetic, nonresistant, uninvolved, unconcerned, matter-of-fact, emotionless

5 Syllables

disinterested, unemotional, unresponsive, tortoiselike, dispassionate, inexcitable, desensitized, unexcitable, unimpassioned, unsentimental, unidealistic

6 Syllables

uncompassionate, undemonstrative