The word "un-tarnished" refers to something that is spotless, clean, and free from blemishes or tarnish. Antonyms of "untarnished" include "tarnished," "stained," "dirty," "blemished," "spoiled," "contaminated," and "corrupted." These words are used to describe something that has lost its original luster, purity, or integrity. For example, a piece of silverware that has been left exposed to the elements will eventually tarnish and lose its shine, becoming "tarnished." Similarly, a reputation that has been sullied by rumors or scandals can be said to be "stained" or "corrupted.