{ } a. [ L. lethargicus, Gr. lhqargiko`s: cf. F. léthargique. See Lethargy. ] Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy. -- Le*thar"gic*al*ly, adv. -- Le*thar"gic*al*ness, n. -- Le*thar"gic*ness, n. [1913 Webster]