Relatively mild impairment of consciousness resulting in reduced alertness and awareness; this condition has many causes but is ultimately due to generalized brain dysfunction. [G. lethargia, drowsiness]
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1) abnormal drowsiness
2) the quality or state of being lazy, sluggish, or indifferent
lethargic adj
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n.
mental and physical sluggishness: a degree of inactivity and unresponsiveness approaching or verging on the unconscious. The condition results from disease (such as sleeping sickness) or hypnosis.
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leth·ar·gy (lethґər-je) [Gr. lēthargia drowsiness] 1. a lowered level of consciousness marked by listlessness, drowsiness, and apathy; see also consciousness. 2. a condition of indifference.Medical dictionary. 2011.