From Longman Dictionary of Contemporary Englishuntreatedun‧treat‧ed /ʌnˈtriːtɪd/ adjective 1 MCURE#an untreated illness or injury has not had medical treatment2 Tharmful substances that are untreated have not been made safe untreated sewage3 untreated wood has not had any substances put on it to preserve it
Examples from the Corpus
untreated• untreated drinking water• Heatley stayed until 3.30 a.m., when all of the untreated mice had died.• When untreated, narcolepsy can be a dangerous condition.• Left untreated, the disease produces massive skin folds, fissures and a weeping cauliflower surface that produces a terrible odour.• If left untreated, they stop suckling and quickly get weakened. 