Pronunciation: (leth'ur-jē), [key]
1. the quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity.
2. Pathol.an abnormal state or disorder characterized by overpowering drowsiness or sleep.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.