The Collaborative International Dictionary of English v.0.48:

Untarnished \Untarnished\
   See tarnished.

WordNet (r) 3.0 (2006):

untarnished
    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:

97 Moby Thesaurus words for "untarnished":
   Christian, blameless, bleached, blotless, bright, chaste, clean,
   cleanly, creditable, dainty, decent, dirt-free, erect, estimable,
   ethical, fair, fastidious, faultless, fresh, full of integrity,
   good, high-minded, high-principled, highly respectable, honest,
   honorable, immaculate, innocent, inviolate, irreproachable, just,
   kosher, law-abiding, law-loving, law-revering, lily-white, manly,
   moral, noble, nonpolluted, of cleanly habits, principled, pure,
   pure in heart, purehearted, reputable, respectable, right,
   right-minded, righteous, ritually pure, sexually innocent, shiny,
   smut-free, smutless, snowy, spotless, stainless, sterling, sweet,
   tahar, taintless, true-dealing, true-devoted, true-disposing,
   true-souled, true-spirited, truehearted, tubbed, unadulterated,
   unbesmirched, unblemished, unblotted, uncorrupt, uncorrupted,
   undefiled, unimpeachable, unmuddied, unpolluted, unsmirched,
   unsmudged, unsoiled, unspotted, unstained, unsullied, untainted,
   upright, uprighteous, upstanding, virginal, virtuous,
   well-scrubbed, well-washed, white, whitened, worthy, yeomanly