Listless

dull slow lethargic indifferent passive sluggish tired apathetic languid lifeless vacant sleepy careless inattentive abstracted absent uninterested inert blah heavy limp enervated torpid languorous lukewarm phlegmatic easygoing laid-back slack thoughtless bored heedless neutral faint lymphatic drowsy dreamy dormant energyless impassive languishing insouciant leaden lackadaisical animate out of it stupid supine