taint

This word carries a heavy moral or emotional weight. While "pollute" describes a physical change in the environment, "taint" suggests a loss of innocence, integrity, or purity. It is frequently used in legal or ethical contexts to describe evidence that has been compromised or a legacy that has been ruined by a scandal. There is a lingering sense of permanence associated with this term. Once something is tainted, it is rarely seen as completely clean again, creating a feeling of indelible corruption that persists even after the source of the contamination is removed.