[ leth-er-jee ]
/ ˈlɛθ ər dʒi /

noun, plural leth·ar·gies.

the quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity.
Pathology. an abnormal state or disorder characterized by overpowering drowsiness or sleep.

Origin of lethargy

1325–75; < Late Latin lēthargia < Greek lēthargía, equivalent to lḗtharg(os) drowsy + -ia -y3 (see Lethe, -algia); replacing Middle English litargie < Medieval Latin litargīa < Late Greek, Greek, as above


hy·per·leth·ar·gy, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for lethargy

British Dictionary definitions for lethargy

/ (ˈlɛθədʒɪ) /

noun plural -gies

sluggishness, slowness, or dullness
an abnormal lack of energy, esp as the result of a disease

Derived forms of lethargy

lethargic (lɪˈθɑːdʒɪk) or lethargical, adjectivelethargically, adverb

Word Origin for lethargy

C14: from Late Latin lēthargīa, from Greek lēthargos drowsy, from lēthē forgetfulness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for lethargy

[ lĕthər-jē ]


A state of sluggishness, inactivity, and apathy.
A state of unconsciousness resembling deep sleep.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.