If an object is stainless, it is clean or resistant to discoloration. When a person is described with the adjective stainless, it means that they are exemplary, or extremely good.

If you have any silver-colored appliances in your kitchen, they're probably stainless steel, specially formulated so they won't discolor or corrode. Most everyday spoons and forks are stainless steel as well. If someone refers to your sister's stainless reputation, on the other hand, he is implying that everyone thinks of her as well-behaved, almost saintly. This kind of stainless has been used since the 16th century; stainless steel wasn't invented until 1917.

Definitions of stainless
  1. adjective
    (of reputation) free from blemishes
    synonyms: unstained, unsullied, untainted, untarnished
    unblemished, unmarred, unmutilated
    free from physical or moral spots or stains
  2. noun
    steel containing chromium that makes it resistant to corrosion
    synonyms: chromium steel, stainless steel
    see moresee less
    type of:
    alloy steel
    steel who characteristics are determined by the addition of other elements in addition to carbon
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