Etymology
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lethargic (adj.)

late 14c., litargik, "morbidly drowsy, manifesting lethargy," from Latin lethargicus "affected with lethargy," from Greek lethargikos "drowsy," from lethargos "forgetful; inactive" (see lethargy). From 1590s as "pertaining to lethargy." Related: Lethargically. In 17c. also with a verb form, lethargize, and a noun, letharge "lethargic patient."

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Definitions of lethargic

lethargic (adj.)
deficient in alertness or activity;
bullfrogs became lethargic with the first cold nights
Synonyms: unenergetic
From wordnet.princeton.edu

Dictionary entries near lethargic

-let

letch

let-down

lethal

lethality

lethargic

lethargy

Lethe

Letitia

Leto

Lett