What does the word lethargy mean?

Usage examples for lethargy

  1. Dr. Manby, however, told Wilmet not to be too much alarmed at this delirium, for the most immediate danger had passed when the lethargy had given way, and that though fever was probably setting in, there was fair hope that so healthy a boy would be able to struggle through it without permanent harm. – The Pillars of the House, V1 by Charlotte M. Yonge
  2. Again he called out to me, but, deceived by his coolness and nonchalant tones, and by the lethargy a glimpse of the fish, I gave little heed. – Locusts and Wild Honey by John Burroughs
  3. Halfway around again, Sally opened a door, and Joe was almost surprised out of his lethargy. – Space Platform by Murray Leinster