Synonyms and related words :
acedia, aloofness, analgesia, anesthesia, apathy, ataraxia, ataraxy, benumbedness, blah, blahs, callousness, comatoseness, deadness, detachment, disinterest, dispassion, dullness, electronarcosis, heartlessness, hebetude, hopelessness, impassibility, imperception, imperceptiveness, imperceptivity, impercipience, inappetence, inconsiderateness, indifference, insensibility, insensibleness, insensitiveness, insensitivity, insentience, insouciance, lack of appetite, languidness, lethargicalness, lethargy, listlessness, narcosis, narcotization, nonchalance, obtuseness, passiveness, passivity, phlegm, phlegmaticalness, phlegmaticness, pins and needles, plucklessness, resignation, resignedness, sloth, sluggishness, sopor, soporifousness, spiritlessness, spunklessness, stupefaction, stupor, supineness, thick skin, torpidity, torpidness, torpor, unconcern, unfeeling, unfeelingness, unperceptiveness, withdrawnness