The Collaborative International Dictionary of English v.0.48:

chinchy \chinch"y\ (ch[i^]nch"[y^]), adj. [Compar. chinchier
   (ch[i^]n"ch[i^]*[~e]r); superl. chinchiest
   (ch[i^]n"ch[i^]*[e^]st).] [See chinche.]
   same as stingy.

   Syn: cheap, chintzy, stingy, chinche.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

chinchy
    adj 1: embarrassingly stingy [syn: cheap, chinchy,
           chintzy]