naif
    adj 1: marked by or showing unaffected simplicity and lack of
           guile or worldly experience; "a teenager's naive
           ignorance of life"; "the naive assumption that things can
           only get better"; "this naive simple creature with wide
           friendly eyes so eager to believe appearances" [syn:
           naive, naif] [ant: sophisticated]
    n 1: a naive or inexperienced person

Naif \Na"["i]f`\ (?; formerly ?), a. [F. na["i]f. See
   Na["i]ve.]
   1. Having a true natural luster without being cut; -- applied
      by jewelers to a precious stone.
      [1913 Webster]

   2. Na["i]ve; as, a na["i]f remark. --London Spectator.
      [1913 Webster]