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Adjective: uncontaminated  ,ún-kun'ta-mi,ney-tid
  1. Not corrupted by contact or association
    "there is no culture uncontaminated by contact with the outside world"
     
  2. Free from admixture with noxious elements; clean
    "an uncontaminated lake";
    - unpolluted

See also: pure

Antonym: contaminated