naive

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"

of or created by one without formal training; simple or naive in style; "primitive art such as that by Grandma Moses is often colorful and striking"

inexperienced

lacking information or instruction; "lamentably unenlightened as to the laws"

not initiated; deficient in relevant experience; "it seemed a bizarre ceremony to uninitiated western eyes"; "he took part in the experiment as a naive subject"