Obtrectation refers to the act of disparaging or speaking ill about someone. It can be difficult to think of synonyms for this term as it is quite unique. However, some possible synonyms may include denigration, defaming, belittling, disparagement, smear, vilification, slander, calumny, or libel. These words all describe speaking negatively about someone in one way or another. They can be used interchangeably with obtrectation to convey a similar meaning. It is important to remember that using language to tear others down can be hurtful and destructive, and it is always best to use kind and respectful words when talking about others.