un ‧ treat ‧ ed /ʌnˈtriːtəd, ʌnˈtriːtɪd/ BrE AmE adjective
[ Word Family: noun : ↑ treat , ↑ treatment , ↑ mistreatment ; verb : ↑ treat , ↑ mistreat ; adjective : ↑ untreated , ↑ treatable ]
1 . an untreated illness or injury has not had medical treatment
2 . harmful substances that are untreated have not been made safe:
untreated sewage
3 . untreated wood has not had any substances put on it to preserve it