from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of, causing, or characterized by lethargy.

from The Century Dictionary.

  • Affected with lethargy; morbidly sluggish or drowsy; dull; torpid.
  • Marked by lethargy or languor; manifesting sluggishness or apathy: as, lethargic movements; a lethargic government.
  • Producing lethargy; causing languor or apathy; stupefying.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective sluggish, slow
  • adjective indifferent, apathetic

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective deficient in alertness or activity


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ληθαργικός (lethargikos), from λήθαργος (lēthargos, "forgetful, lethargic"), from λήθη (lēthē, "a forgetting, forgetfulness") (from which Lethe ("river in Hades")) + ἀργός (argos, "not working")


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