Synonyms for Stainless (same or very similar meaning)
WordNet sense 1 (steel containing chromium that makes it resistant to corrosion):
stainless steel, chromium steelWordNet sense 2 (of reputation):
unstained, unsullied, untainted, untarnishedWordNet sense 3 (free from physical or moral spots or stains):
unblemishedFrom the ODE community, based on WordNetadd/edit