Source : WordNet®

untreated
     adj 1: not given medical care or treatment; "an untreated disease";
            "the untreated wounded lay on makeshift cots" [ant: {treated}]
     2: not subjected to chemical or physical treatment; "an
        untreated fabric" [ant: {treated}]
     3: (of a specimen for study under a microscope) not treated
        with a reagent or dye