adjective
deficient in alertness or activity
became lethargic after taking the drug
Synonyms: comatose, dopey, heavy, hebetudinous, sluggish, slumberous, stupid, torpid
Related Word: dormant, idle, inactive, inert, passive, supine; apathetic, impassive, phlegmatic, spiritless, stolid; lackadaisical, languid, languorous, listless; dilatory, laggard, slow
Contrasted words: alert, aware, responsive; apt, prompt, quick, ready; brisk, gingery, peppery, spirited
Antonyms: energetic