phlegm - noun

apathy demonstrated by an absence of emotional reactions

expectorated matter; saliva mixed with discharges from the respiratory passages; in ancient and medieval physiology it was believed to cause sluggishness

inactivity; showing an unusual lack of energy

phlegm - thesaurus

emotionlessness   flatness   impassiveness   impassivity   indifference   languor   lethargy   sluggishness   sputum   stolidity   unemotionality