The Collaborative International Dictionary of English v.0.48:

Cheesy \Chees"y\, a.
   Having the nature, qualities, taste, form, consistency, or
   appearance of cheese.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cheesy
    adj 1: of very poor quality; flimsy [syn: bum, cheap,
           cheesy, chintzy, crummy, punk, sleazy, tinny]

Moby Thesaurus II by Grady Ward, 1.0:

107 Moby Thesaurus words for "cheesy":
   Mickey Mouse, abject, abominable, arrant, atrocious, barfy, base,
   beggarly, beneath contempt, bum, cheap, coarse, common,
   contemptible, crappy, creepy, crummy, debased, degraded, depraved,
   despicable, dirty, disgusting, execrable, flagrant, foul,
   fourth-class, fulsome, gaudy, gimcracky, godawful, goshawful,
   grave, grim, gross, hairy, heinous, icky, inferior, irregular,
   little, low, low-class, low-down, low-grade, low-quality, low-test,
   lumpen, mangy, mean, measly, meretricious, miserable, monstrous,
   nefarious, obnoxious, odious, ornery, paltry, pathetic, petty,
   pitiable, pitiful, poky, poor, punk, putrid, rank, reptilian,
   rubbishy, sad, scabby, scrubby, scruffy, scummy, scurvy, scuzzy,
   second-best, second-class, seedy, shabby, shitty, shoddy, sleazy,
   small, sorry, squalid, stinking, stinky, tacky, tatty, third-class,
   third-rate, tinny, trashy, trumpery, two-for-a-cent,
   two-for-a-penny, twopenny, twopenny-halfpenny, unmentionable,
   valueless, vile, vomity, worthless, wretched, yecchy