unpolluted

from WordNet (r) 3.0 (2006)

unpolluted
    adj 1: free from admixture with noxious elements; clean;
           "unpolluted streams"; "a contaminated lake" [syn:
           {uncontaminated}, {unpolluted}]

from The Collaborative International Dictionary of English v.0.48

Unpolluted \Unpolluted\
   See {polluted}.

from Moby Thesaurus II by Grady Ward, 1.0

41 Moby Thesaurus words for "unpolluted":
      bleached, bright, clean, cleanly, dainty, dirt-free, fair,
      fastidious, fresh, immaculate, kosher, nonpolluted,
      of cleanly habits, pure, ritually pure, shiny, smut-free, smutless,
      spotless, stainless, sweet, tahar, tubbed, unadulterated,
      unbesmirched, unblemished, unblotted, undefiled, unmuddied,
      unsmirched, unsmudged, unsoiled, unspotted, unstained, unsullied,
      untainted, untarnished, well-scrubbed, well-washed, white,
      whitened