If three of the bodily humors (temperaments) boil down to “sad,” “glad,” and “mad,” what’s the fourth?

Dear Cecil: We were talking about the medieval theory of the four bodily humors and noticed that “sanguine,” “choleric,” and “melancholy” correspond roughly in meaning with the modern English “glad,” “mad,” and “sad.” We were wishing we knew a rhyming word for “phlegmatic.” Can you think of one? Justin Quisitive, Arlington, Massachusetts