The term "man-stealer" is considered derogatory and offensive, and should not be used under any circumstances. Instead, there are several synonyms that can be used to refer to a person who steals someone's partner or spouse. These include homewrecker, seducer, mistress, paramour, adulterer, and cuckoo. These terms are more neutral and do not carry the same negative connotations as "man-stealer." It's important to choose words carefully and avoid using language that perpetuates harmful stereotypes and discrimination. Ultimately, respect for others and their relationships should be the priority.