The Collaborative International Dictionary of English v.0.48:

Mope \Mope\, v. t.
   To make spiritless and stupid. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mope \Mope\, n.
   A dull, spiritless person. --Burton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mope \Mope\, v. i. [imp. & p. p. Moped; p. pr. & vb. n.
   Moping.] [Cf. D. moppen to pout, Prov. G. muffen to sulk.]
   To be dull and spiritless; to spend time doing little; as, to
   mope around the house. "Moping melancholy." --Milton.
   [1913 Webster]

         A sickly part of one true sense
         Could not so mope.                       --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mope
    n 1: someone who wastes time [syn: dallier, dillydallier,
         dilly-dallier, mope, lounger]
    v 1: move around slowly and aimlessly [syn: mope, mope
         around]
    2: be apathetic, gloomy, or dazed [syn: mope, moon around,
       moon about]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "mope":
   ache, agonize, amble, bitch, bleed, brood, brood over, brooder,
   clock watcher, dallier, dawdle, dawdler, depressive, despond,
   diddler, dillydallier, do-nothing, dolittle, doodler, drift,
   faineant, fret, gentleman of leisure, gloomy Gus, goldbrick,
   goldbricker, goof-off, grieve, grouch, grump, idler, laggard,
   linger, lingerer, loafer, loiterer, loller, lotus-eater, lounger,
   lubber, melancholiac, melancholic, moper, mosey, mourn, muck, pine,
   pine away, potterer, pout, putterer, slouch, sloucher, slug,
   sluggard, sorrow, sourpuss, stick-in-the-mud, stroll, sulk,
   take on, time killer, time waster, trifler, waiter on Providence