drowsy

[drou-zee]
adjective, drowsier, drowsiest.
1.
half-asleep; sleepy.
2.
marked by or resulting from sleepiness.
3.
dull; sluggish.
4.
inducing lethargy or sleepiness: drowsy spring weather.

Origin:
1520–30; drowse + -y1

drowsily, adverb
drowsiness, noun


1. somnolent, dozy. 3. lethargic, listless.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
drowsy (ˈdraʊzɪ)
 
adj , drowsier, drowsiest
1.  heavy with sleepiness; sleepy
2.  inducing sleep; soporific
3.  sluggish or lethargic; dull
 
'drowsily
 
adv
 
'drowsiness
 
n

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

drowsy
1520s, from O.E. drusan, drusian "sink," also "become low, slow, or inactive" (related to dreosan "to fall"), from P.Gmc. *drus- (see dreary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

drowsiness drows·i·ness (drou'zē-nĭs)
n.
A state of impaired awareness associated with a desire or inclination to sleep. Also called hypnesthesia.

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
More commonly, they exploit fire's drowsiness in the early morning.
Riders must be physically able to complete the ride and not be on medications
  that cause drowsiness or inattentiveness.
Each night he added to the pattern of his fancies until drowsiness closed down
  upon some vivid scene with an oblivious embrace.
Many of these are known to cause fatigue and daytime drowsiness.
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