Simple past tense and past participle of stain.(verb)
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Use "stained" in a sentence
"Mrs Dunwoody glared at him as if she suspected that he doubted her word, but she made no reply and produced from under her table a bottle of Lysol about half-full, the neck sticky and covered with dust and the label stained by the drips that had run down over it."
"“A dissolute rake may indeed be most charming, my young lord, but if the coffers are strained and the title stained, you shall have a most difficult time convincing a steady-minded lady to marry you.”"
"They are best (color wise) in stained/dingy water."