There are a number of synonyms for the term "morally polluted" that can be used to describe someone whose behaviour or actions are considered unethical, immoral or in some way harmful or destructive. Some of these synonyms include "immoral", "unethical", "corrupt", "depraved", "wicked", "vicious", "dissolute", "debauched", "sinful", "perverted", "evil", "harmful", "toxic", "polluted", "tainted", "ruined", "contaminated", "infected". Each of these words carries its own specific connotations and shades of meaning, but all of them express the idea that someone's behaviour or actions are morally unacceptable or inappropriate.