phlegmatic
fleg-MAT-ikadjMeaning calm and unexcitable by nature; slow to show feeling
Memory hook a FROG on a MAT: fleg-MAT-ic. While the ducks splash and squawk around him, the big frog sits on his lily pad, blinking slowly. Nothing excites him; he is phlegmatic.
Even as a baby, Sam was phlegmatic: he rarely cried, rarely squealed and hardly ever fussed.
In context Her brother was excitable and loud, but she was phlegmatic; even on the day she won the scholarship, she only nodded and said, “Good.”
Similar unemotional, stolid, unexcitable, placid
Opposite excitable, passionate, emotional
From Greek phlegma, phlegm: old doctors believed too much of this body fluid made a person sluggish and calm.