chutzpa

from WordNet (r) 3.0 (2006)

chutzpa
    n 1: (Yiddish) unbelievable gall; insolence; audacity [syn:
         {chutzpa}, {chutzpah}, {hutzpah}]

from The Collaborative International Dictionary of English v.0.48

chutzpa \chutzpa\, chutzpah \chutzpah\n. [Yiddish khutzpa.]
   aggressive boldness or unmitigated effrontery; gall; as, he
   had the chutzpah to question my decision. [Also spelled
   {hutzpa}, and {hutzpah}.]

   Syn: audacity, audaciousness.
        [WordNet 1.5]