leth·ar·gy

[leth-er-jee]
noun, plural leth·ar·gies.
1.
the quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity.
2.
Pathology. an abnormal state or disorder characterized by overpowering drowsiness or sleep.

Origin:
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
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Lethargy is always a great word to know.
So is callithumpian. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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World English Dictionary
lethargy (ˈlɛθədʒɪ) [Click for IPA pronunciation guide]
 
n , pl -gies
1.  sluggishness, slowness, or dullness
2.  an abnormal lack of energy, esp as the result of a disease
 
[C14: from Late Latin lēthargīa, from Greek lēthargos drowsy, from lēthē forgetfulness]
 
lethargic
 
adj
 
le'thargical
 
adj
 
le'thargically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

lethargy
late 14c., from L.L. lethargia, from Gk. lethargia "forgetfulness," from lethargos "forgetful," originally "inactive through forgetfulness," from lethe "forgetfulness" (see latent) + argos "idle."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lethargy leth·ar·gy (lěth'ər-jē)
n.

  1. A state of sluggishness, inactivity, and apathy.

  2. 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.
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Example sentences
Yet there was no sign of lethargy or sluggishness anywhere about it.
The writing is brisk, as befits the episodic manner of telling, but there is a
  prevailIng atmosphere of discontent and lethargy.
Gloom leads to lethargy, and lethargy exacerbates the sadness.
The delay owes more to official lethargy and squabbling than to protectionism
  by lawyers, many of whom welcome the move.
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