Definitions for "Lethargic"
Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy.
the state of being abnormally drowsy or stupor (Morris 1992).
refers to someone who is not 'all there'. The condition is characterised by apathy, listlessness and drowsiness.
Whereas the ennuyé person is afflicted with an oppressive sense of the too-muchness of existence, the lethargic [the River Lethe, in Greek mythology, is the river of oblivion] person is rendered stagnant by the dullness of it all: He is dead-while-alive. See: ENNUI, LANGUID, SLUGGISH, TIRED, TORPID.
slow; sluggish.
sluggish; slow to respond
deficient in alertness or activity; "bullfrogs became lethargic with the first cold nights"