of, relating to, or affected with lethargy; drowsy; sluggish; apathetic.
producing lethargy: The lethargic heat and humidity of the day made me want to do nothing but nap.
Origin of lethargic
Synonyms for lethargic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
late 14c., litargik, from Latin lethargicus "affected with lethargy," from Greek lethargikos, from lethargos (see lethargy). Related: Lethargically.
Online Etymology Dictionary, © 2010 Douglas Harper