Stained is a word that typically refers to something that has been marked or discoloured in some way. Synonyms of stained include marked, tainted, blemished, soiled, and contaminated. These words all suggest some kind of imperfection or damage that has been done to an object, either physically or metaphorically. Other synonyms for stained include smudged, painted, dyed, or coloured, which emphasize a more intentional change to the object. Overall, synonyms for stained vary in connotation and can provide different levels of detail or nuance to a description depending on the context.