General Antonyms:
* Tainted
* Defiled
* Contaminated
* Polluted
* Stained
* Corrupted
* Soiled
* Impure
* Blemished
More Specific Antonyms:
* Spoiled: If you're referring to a pristine object or environment.
* Dishonored: If you're talking about reputation or integrity.
* Compromised: If you're discussing something that has been weakened or made vulnerable.
The best antonym will depend on the exact meaning you're trying to convey.