Criminalised refers to an act that has been made illegal by a governing authority. There are various synonyms that can be used to replace the term criminalised in a sentence or phrase. Such synonyms may include prohibited, outlawed, banned, forbidden, and proscribed. These words are suitable for expressing the idea of an act being made unlawful. Other synonyms that can be used for criminalised include illegalised, condemned, debarred, and disallowed. All of these words convey a sense of restriction or disapproval towards a particular act or behavior. Overall, using these synonyms for criminalised can add variety and depth to one's writing.