uncontaminated

uncontaminated
    adj 1: not corrupted by contact or association; "there is no
           culture uncontaminated by contact with the outside world"
           [ant: {contaminated}]
    2: free from admixture with noxious elements; clean; "unpolluted
       streams"; "a contaminated lake" [syn: {uncontaminated},
       {unpolluted}]
    

27 Moby Thesaurus words for "uncontaminated":
      absolute, beyond all praise, chaste, defectless, faultless,
      flawless, ideal, immaculate, impeccable, indefectible, indefective,
      infallible, irreproachable, just right, peerless, perfect, pure,
      sinless, spotless, stainless, taintless, unadulterated,
      unblemished, unfaultable, unmixed, unspotted, untainted