If an injury or illness is left untreated, it is not given medical treatment. If left untreated the condition may become chronic. the consequences of untreated tuberculosis
not given medical care or treatment; "an untreated disease"; "the untreated wounded lay on makeshift cots"
not given medical care or treatment; "an untreated disease"; "the untreated wounded lay on makeshift cots
(of a specimen for study under a microscope) not treated with a reagent or dye not subjected to chemical or physical treatment; "an untreated fabric"
Untreated materials are in their natural or original state, often before being prepared for use in a particular process. All the bedding is made of simple, untreated cotton In its untreated state the carbon fibre material is rather like cloth. = raw
Untreated materials, water, or chemicals are harmful and have not been made safe. the dumping of nuclear waste and untreated sewage