The Collaborative International Dictionary of English v.0.48:

Unsoiled \Unsoiled\
   See soiled.

WordNet (r) 3.0 (2006):

unsoiled
    adj 1: without soil or spot or stain [syn: unsoiled,
           unspotted, unstained]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "unsoiled":
   bleached, blotless, bright, chaste, clean, cleanly, dainty,
   dirt-free, fair, fastidious, fresh, immaculate, impeccable,
   innocent, kosher, nonpolluted, of cleanly habits, pure,
   pure in heart, purehearted, ritually pure, sexually innocent,
   shiny, smut-free, smutless, snowy, spotless, stainless, sweet,
   tahar, taintless, tubbed, unadulterated, unbesmirched, unblemished,
   unblotted, uncorrupt, undefiled, unmuddied, unpolluted, unsmirched,
   unsmudged, unspotted, unstained, unsullied, untainted, untarnished,
   virtuous, well-scrubbed, well-washed, white, whitened