Na["i]ve

naive \na*ive"\, naive \na*["i]ve"\(n[aum]*[=e]v"), a. [F.
   na["i]f, fem. na["i]ve, fr. L. nativus innate, natural,
   native. See {Native}, and cf. {Na["i]f}.]
   1. Having native or unaffected simplicity; ingenuous;
      artless; frank; as, na["i]ve manners; a na["i]ve person;
      na["i]ve and unsophisticated remarks.
      [1913 Webster]

   2. Having a lack of knowledge, judgment, or experience;
      especially, lacking sophistication in judging the motives
      of others; credulous; as, a naive belief in the honesty of
      politicians.
      [PJC]
    

116 Moby Thesaurus words for "naive":
      artless, awkward, befoolable, blankminded, bluff, blunt,
      born yesterday, budding, callow, candid, childlike, confiding,
      credulous, cullible, deceivable, deludable, dependent, depending,
      dewy, direct, dumb, dupable, easy, empty, empty-headed,
      exploitable, foolable, frank, fresh, gauche, green, groping,
      growing, guileless, gullible, hoaxable, hoodwinkable, humbugable,
      ignorant, immature, impubic, inane, inexperienced, ingenu,
      ingenuous, innocent, intact, juicy, know-nothing, minor, nescient,
      new-fledged, open, openhearted, original, outspoken, persuadable,
      plain, raw, reliant, relying, ripening, sappy, seduceable, simple,
      simplehearted, simpleminded, sincere, single-hearted,
      single-minded, soft, strange to, susceptible, tender, tentative,
      trustful, trusting, trusty, unacquainted, unadult, unaffected,
      unapprized, unartificial, uncomprehending, unconversant, underage,
      undeveloped, unenlightened, unfamiliar, unfledged, unformed,
      unguarded, unilluminated, uninformed, uninitiated, unintelligent,
      unknowing, unlicked, unmellowed, unposted, unreserved, unripe,
      unschooled, unseasoned, unsophisticated, unstudied, unsure,
      unsuspecting, unsuspicious, unversed, unwary, vacuous, vernal,
      victimizable, virginal, without suspicion