The Collaborative International Dictionary of English v.0.48:

Stainless \Stain"less\, a.
   Free from stain; immaculate. --Shak.
   [1913 Webster]

         The very care he took to keep his name
         Stainless, with some was evidence of shame. --Crabbe.
   [1913 Webster]

   Syn: Blameless; spotless; faultless. See Blameless.
        [1913 Webster]

WordNet (r) 3.0 (2006):

stainless
    adj 1: (of reputation) free from blemishes; "his unsullied
           name"; "an untarnished reputation" [syn: stainless,
           unstained, unsullied, untainted, untarnished]
    n 1: steel containing chromium that makes it resistant to
         corrosion [syn: stainless steel, stainless, chromium
         steel]