naive

marked by or showing unaffected simplicity and lack of guile or worldly experience

a teenager's naive ignorance of life

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