drowsiness

from WordNet (r) 3.0 (2006)
drowsiness
    n 1: a very sleepy state; "sleepiness causes many driving
         accidents" [syn: {sleepiness}, {drowsiness}, {somnolence}]
         [ant: {sleeplessness}, {wakefulness}]
from The Collaborative International Dictionary of English v.0.48
drowsiness \drow"si*ness\, n.
   State of being drowsy. --Milton.
   [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
48 Moby Thesaurus words for "drowsiness":
      acedia, apathy, boredom, doziness, dullness, enervation, ennui,
      fatigue, heaviness, hebetude, inanimation, indifference, jadedness,
      lackadaisicalness, languidness, languishment, languor,
      languorousness, lassitude, lenitude, lentor, lethargy,
      lifelessness, listlessness, oscitancy, oscitation, pandiculation,
      passivity, phlegm, satedness, sleepiness, sloth, slothfulness,
      slowness, sluggishness, somnolence, somnolency, stretching,
      stupefaction, stupor, supineness, torpidity, torpidness, torpitude,
      torpor, weariness, world-weariness, yawning
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