lethargy

[leth-er-jee]
noun, plural lethargies.
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

hyperlethargy, noun
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World English Dictionary
lethargy (ˈlɛθədʒɪ)
 
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

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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.
If you have unexplained lethargy, you might check that out as well.
Such conversations can drain your energy and contribute to feelings of
  resentment and lethargy as the new term begins.
To the extent there is a national sport, it is either driving dangerously or
  lethargy.
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