[1] : The Collaborative International Dictionary of English v.0.48

lousy \lous"y\, a.
   1. infested with lice.
      1913 webster

   2. mean; contemptible; as, lousy knave. informal
      1913 webster

            such lousy learning as this is.       --bale.

   3. very bad; as, to feel lousy; to do a lousy job.
      pjc

[2] : WordNet (r) 2.0

lousy
     adj 1: very bad; "a lousy play"; "it's a stinking world" syn: icky,
             crappy, rotten, shitty, stinking, stinky
     2: infested with lice; "burned their lousy clothes"
     3: vile; despicable; "a dirty or lousy trick"; "a filthy
        traitor" syn: dirty, filthy
     also: lousiest, lousier
see also:
icky crappy rotten shitty stinking stinky 
dirty filthy lousiest lousier 

[3] : Moby Thesaurus II by Grady Ward, 1.0

88 moby thesaurus words for "lousy":
   abominable, alive with, arrant, atrocious, awful, bad, base,
   beastly, beneath contempt, beset, blameworthy, brutal,
   contemptible, deplorable, despicable, detestable, dire, dirty,
   disgusting, dreadful, egregious, enormous, fetid, filthy, flagrant,
   foul, fulsome, grievous, gross, grubby, hateful, heinous, horrible,
   horrid, infamous, inferior, infested, lamentable, loathsome, low,
   low-quality, mean, miserable, monstrous, nasty, nefarious, noisome,
   notorious, obnoxious, odious, offensive, outrageous, pedicular,
   pediculous, pitiable, pitiful, plagued, poor, rank, ratty, ravaged,
   regrettable, reprehensible, repulsive, rotten, sad, scandalous,
   schlock, scurvy, second-rate, shabby, shameful, shocking, shoddy,
   sordid, squalid, teeming, terrible, too bad, unclean, vicious,
   vile, villainous, woeful, wormy, worst, worthless, wretched

Lousy >> L Words
Lousy, definition of term: Lousy
lousy_pag1.html