phlegm
flem
noun
Thick, sticky mucus from the respiratory system, often coughed up.
"He coughed up a lot of phlegm."
noun
A calm, unemotional temperament, historically one of the four bodily humours.
"His phlegm allowed him to remain composed."
Thesaurus
Synonyms: unemotionality, emotionlessness, impassivity, stolidity, indifference, impassiveness, sputum, languor, lethargy, sluggishness, flatness