- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for lethargical
late 14c., litargik, from Latin lethargicus "affected with lethargy," from Greek lethargikos, from lethargos (see lethargy). Related: Lethargically.
Online Etymology Dictionary, © 2010 Douglas Harper