WordNet (r) 3.0 (2006):

good-for-nothing
    adj 1: without merit; "a sorry horse"; "a sorry excuse"; "a lazy
           no-count, good-for-nothing goldbrick"; "the car was a no-
           good piece of junk" [syn: good-for-nothing, good-for-
           naught, meritless, no-account, no-count, no-
           good, sorry]
    n 1: an idle worthless person [syn: goldbrick, goof-off, ne
         'er-do-well, good-for-nothing, no-account, good-for-
         naught]

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "good-for-nothing":
   Bowery bum, NG, bad lot, beachcomber, beggar, beggarly fellow,
   blighter, bone-lazy, budmash, bum, bummer, cadging, caitiff, cheap,
   derelict, devil, dilatory, do-nothing, doless, drifter, dronish,
   drony, drunkard, easy, ergophobic, faineant, good-for-naught, hobo,
   human wreck, indolent, junk, junky, laggard, lax, lazy, lazzarone,
   lowlife, mauvais sujet, mean wretch, mucker, no-account, no-good,
   nonaggressive, not worth having, not worth mentioning,
   not worthwhile, nothing, nugacious, nugatory, parasitic,
   pauvre diable, pilgarlic, poor creature, poor devil,
   procrastinative, profligate, remiss, rounder, sad case, sad sack,
   scapegrace, scrounging, shabby, shiftless, shoddy, skid-row bum,
   slack, slothful, slow, sponging, stiff, sundowner, swagman, tramp,
   trashy, trivial, truant, unenterprising, unworthy, vag, vagabond,
   vagrant, valueless, vaurien, waster, wastrel, work-shy, worthless,
   worthless fellow, wretch