the quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity.

Pathology . an abnormal state or disorder characterized by overpowering drowsiness or sleep.

noun

activity , busyness , energy , life , liveliness , vigor , vitality , vivaciousness , vivacity

noun

apathy , coma , disinterest , disregard , drowsiness , dullness , hebetude , heedlessness , idleness , impassivity , inaction , inactivity , inanition , indifference , indolence , inertia , inertness , insouciance , languor , lassitude , listlessness , passiveness , phlegm , sleep , sleepiness , sloth , slowness , slumber , stupor , supineness , torpidity , torpidness , torpor , unconcern , unmindfulness , languidness , leadenness , sluggishness , incuriosity , incuriousness , insensibility , insensibleness , stolidity , stolidness , uninterest , unresponsiveness , laziness , sopor , unconsciousness