le·thar·gic /ləˈθɑrʤɪk, lɛ-/
  (a.)昏睡的;遲鈍的
  Le·thar·gic Le·thar·gic·al a.  Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy. -- Le*thar*gic*al*ly, adv. -- Le*thar*gic*al*ness, n. -- Le*thar*gic*ness, n.
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  lethargic
       adj : deficient in alertness or activity; "bullfrogs became
             lethargic with the first cold nights" [syn: unergetic]
             [ant: energetic]