incontaminate

from The Collaborative International Dictionary of English v.0.48

Incontaminate \In`con*tam"i*nate\, a. [L. incontaminatus. See
   {In-} not, and not, and {Contaminate}.]
   Not contaminated; pure. --Moore. -- {In`con*tam"i*nate*ness},
   n.
   [1913 Webster]