"phlegm" in the noun sense
1. emotionlessness, impassivity, impassiveness, phlegm, indifference, stolidity, unemotionality
apathy demonstrated by an absence of emotional reactions
2. phlegm, sputum
expectorated matter saliva mixed with discharges from the respiratory passages in ancient and medieval physiology it was believed to cause sluggishness
3. languor, lethargy, sluggishness, phlegm, flatness
inactivity showing an unusual lack of energy
"the general appearance of sluggishness alarmed his friends"
Source: WordNet® (An amazing lexical database of English)
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