lethargy — the quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity.
apathy — You can use apathy to talk about someone's state of mind if you are criticizing them because they do not seem to be interested in or enthusiastic about anything.
coma — Someone who is in a coma is in a state of deep unconsciousness.
heedlessness — The state or character of being heedless; inattention; carelessness; thoughtlessness.
idleness — the quality, state, or condition of being lazy, inactive, or idle: His lack of interest in the larger world and his consummate idleness were the causes of their dreadful divorce.
impassivity — without emotion; apathetic; unmoved.
listlessness — having or showing little or no interest in anything; languid; spiritless; indifferent: a listless mood; a listless handshake.
passiveness — Also, passiveness [pas-iv-nis] /ˈpæs ɪv nɪs/ (Show IPA). the state or condition of being passive.
phlegm — the thick mucus secreted in the respiratory passages and discharged through the mouth, especially that occurring in the lungs and throat passages, as during a cold.
sleep — to take the rest afforded by a suspension of voluntary bodily functions and the natural suspension, complete or partial, of consciousness; cease being awake.