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Adjective: gullible  gú-lu-bul
  1. Naive and easily deceived or tricked
    "at that early age she had been gullible and in love";
    - fleeceable, green
  2. Easily tricked because of being too trusting
    "gullible tourists taken in by the shell game"

See also: naif, naïf, naive, naïve, unwary, wet behind the ears

Encyclopedia: Gullible