overconfident

from WordNet (r) 3.0 (2006)

overconfident
    adj 1: marked by excessive confidence; "an arrogant and cocksure
           materialist"; "so overconfident and impudent as to speak
           to the queen"; "the less he knows the more positive he
           gets" [syn: {cocksure}, {overconfident}, {positive}]

from The Collaborative International Dictionary of English v.0.48

Overconfident \O"ver*con"fi*dent\, a.
   Confident to excess. -- {O"ver*con"fi*dent*ly}, adv.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

58 Moby Thesaurus words for "overconfident":
      arrogant, assured, audacious, brash, brazen, brazenfaced, cocksure,
      cocky, confident, convinced, decided, determined, foolhardy, hasty,
      heedless, hubristic, improvident, imprudent, impudent, incautious,
      indiscreet, injudicious, insolent, overbearing, overbold,
      overcareless, oversure, overweening, persuaded, poised, pompous,
      positive, presuming, proud, pushful, pushy, rash, reassured,
      secure, self-assertive, self-assured, self-confident,
      self-important, self-reliant, short-sighted, sure, swaggering,
      temerarious, thoughtless, unafraid, unchary, undoubting,
      unfaltering, unhesitating, unwary, unwavering, uppity,
      vainglorious