marked by or showing unaffected simplicity and lack of guile or worldly experience; "a teenagers 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" (同)naif
not subjected to chemical or physical treatment; "an untreated fabric"
(of a specimen for study under a microscope) not treated with a reagent or dye
not given medical care or treatment; "an untreated disease"; "the untreated wounded lay on makeshift cots"