overzealous

from WordNet (r) 3.0 (2006)

overzealous
    adj 1: marked by excessive enthusiasm for and intense devotion
           to a cause or idea; "rabid isolationist" [syn: {fanatic},
           {fanatical}, {overzealous}, {rabid}]

from The Collaborative International Dictionary of English v.0.48

Overzealous \O"ver*zeal"ous\, a.
   Too zealous.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

88 Moby Thesaurus words for "overzealous":
      accident-prone, at fever pitch, balking, balky, bigoted, breakneck,
      bulldogged, bulletheaded, bullheaded, careless, case-hardened,
      delirious, desperate, devil-may-care, dogged, dogmatic,
      extravagant, extreme, extremist, fanatic, fanatical, febrile,
      feverish, frantic, frenetic, frenzied, furious, haggard,
      hardheaded, harum-scarum, hasty, headlong, headstrong, hectic,
      hotheaded, hurried, hysteric, impetuous, infatuated, inordinate,
      insane, intolerant, irrational, mad, mulish, obstinate,
      opinionated, overanxious, overdesirous, overdevout, overeager,
      overenthusiastic, overreligious, overrighteous, perfervid,
      persevering, pertinacious, pigheaded, precipitant, precipitate,
      precipitous, rabid, reckless, restive, sanctimonious, self-willed,
      set, slap-bang, slapdash, stiff-necked, strong-willed,
      strongheaded, stubborn, sulky, sullen, tenacious, ultrareligious,
      ultrazealous, uncooperative, unreasonable, unregenerate, wanton,
      wild, wild-eyed, wild-looking, willful, zealotic, zealous