Definition: (adjective) Having or suggesting a calm, sluggish temperament; unemotional.
Synonyms: indifferent, cold, heavy, dull, stoical, bovine, apathetic, frigid, lymphatic, listless, impassive, stolid, unfeeling, undemonstrative.
Usage: No sign of astonishment appeared on Emil's phlegmatic face.
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Source: The Free Dictionary