The Collaborative International Dictionary of English v.0.48:

Untainted \Untainted\
   See tainted.

WordNet (r) 3.0 (2006):

untainted
    adj 1: (of reputation) free from blemishes; "his unsullied
           name"; "an untarnished reputation" [syn: stainless,
           unstained, unsullied, untainted, untarnished]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "untainted":
   absolute, beyond all praise, bleached, blotless, bright, chaste,
   clean, cleanly, conserved, dainty, defectless, dirt-free, fair,
   fastidious, faultless, flawless, fresh, ideal, immaculate,
   impeccable, indefectible, indefective, infallible, innocent,
   intact, irreproachable, just right, kept, kosher, nonpolluted,
   of cleanly habits, peerless, perfect, preserved, protected, pure,
   pure in heart, purehearted, ritually pure, saved,
   sexually innocent, shiny, sinless, smut-free, smutless, snowy,
   spared, spotless, stainless, sweet, tahar, taintless, tubbed,
   unadulterated, unbesmirched, unblemished, unblotted,
   uncontaminated, uncorrupt, undamaged, undefiled, unfaultable,
   unmixed, unmuddied, unpolluted, unsmirched, unsmudged, unsoiled,
   unspoiled, unspotted, unstained, unsullied, untarnished, virtuous,
   well-conserved, well-scrubbed, well-washed, white, whitened