The Collaborative International Dictionary of English v.0.48:

Lazy \La"zy\, a. [Compar. Lazier; superl. Laziest.] [OE.
   lasie, laesic, of uncertain origin; cf. F. las tired, L.
   lassus, akin to E. late; or cf. LG. losig, lesig.]
   1. Disinclined to action or exertion; averse to labor; idle;
      shirking work. --Bacon.
      [1913 Webster]

   2. Inactive; slothful; slow; sluggish; as, a lazy stream.
      "The night owl's lazy flight." --Shak.
      [1913 Webster]

   3. Wicked; vicious. [Obs. or Prov. Eng.] --B. Jonson.
      [1913 Webster]

   Lazy tongs, a system of jointed bars capable of great
      extension, originally made for picking up something at a
      distance, now variously applied in machinery.

   Syn: Idle; indolent; sluggish; slothful. See Idle.
        [1913 Webster]

WordNet (r) 3.0 (2006):

lazy
    adj 1: moving slowly and gently; "up a lazy river"; "lazy white
           clouds"; "at a lazy pace"
    2: disinclined to work or exertion; "faineant kings under whose
       rule the country languished"; "an indolent hanger-on"; "too
       lazy to wash the dishes"; "shiftless idle youth"; "slothful
       employees"; "the unemployed are not necessarily work-shy"
       [syn: faineant, indolent, lazy, otiose, slothful,
       work-shy]

Moby Thesaurus II by Grady Ward, 1.0:

159 Moby Thesaurus words for "lazy":
   Micawberish, airy, ambling, backward, bone-lazy, bum, bum around,
   cadging, careless, casual, cautious, circumspect, claudicant,
   comatose, crawling, creeping, creeping like snail, cursory,
   dallying, degage, delaying, deliberate, dilatory, dillydallying,
   disregardant, disregardful, do nothing, do-nothing, doless,
   dronish, drony, easy, easygoing, ergophobic, faineant, faltering,
   flagging, flippant, foot-dragging, forgetful, free and easy,
   gentle, goldbrick, good-for-nothing, goof off, gradual, halting,
   hang around, heedless, hobbled, hobbling, idle, inactive,
   inconsiderate, indifferent, indolent, inert, insouciant,
   lackadaisical, laggard, lagging, languid, languorous, lax, laze,
   leisurely, lethargic, lie around, limping, lingering, listless,
   loaf, loiter, loiter about, loitering, loll, loll around,
   lollop around, lounge, lounge around, lumbering, moderate,
   mooch around, moon, moon around, neglectful, negligent,
   nonaggressive, oblivious, offhand, otiose, parasitic, passive,
   perfunctory, poking, poky, procrastinating, procrastinative,
   procrastinatory, reckless, regardless, relaxed, reluctant, remiss,
   respectless, sauntering, scrounging, shiftless, shuffling,
   sit around, slack, slothful, slouch, slouch around, slow,
   slow as death, slow as molasses, slow as slow, slow-crawling,
   slow-foot, slow-going, slow-legged, slow-moving, slow-paced,
   slow-poky, slow-running, slow-sailing, slow-stepped, sluggish,
   snail-paced, snaillike, sponging, staggering, stand around,
   strolling, supine, tactless, tentative, thoughtless, toddling,
   torpid, tortoiselike, tottering, trifling, trudging, turtlelike,
   undiplomatic, unenterprising, unheedful, unheeding, unhurried,
   unmindful, unprepared, unready, unsolicitous, untactful,
   unthinking, waddling, work-shy