Antonyms of adj phlegmatic

1 sense of phlegmatic

Sense 1
phlegmatic, phlegmatical -- (showing little emotion; "a phlegmatic...and certainly undemonstrative man")

INDIRECT (VIA unemotional) -> emotional -- (of more than usual emotion; "his behavior was highly emotional")

Similarity of adj phlegmatic

1 sense of phlegmatic

Sense 1
phlegmatic, phlegmatical -- (showing little emotion; "a phlegmatic...and certainly undemonstrative man")
       => unemotional (vs. emotional) -- (unsusceptible to or destitute of or showing no emotion)