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Adjective: untreated  ,ún'tree-tid
  1. Not given medical care or treatment
    "an untreated disease"; "the untreated wounded lay on makeshift cots"
  2. Not subjected to chemical or physical treatment
    "an untreated fabric"
  3. (of a specimen for study under a microscope) not treated with a reagent or dye

See also: raw, unprocessed, unstained

Antonym: treated