Badmouth
Part of speech: verb
Definition: To criticize or malign, especially unfairly or spitefully.
Malign
Part of speech: adjective
Definition: evil or malignant in disposition, nature, intent or influence.malevolent.
Part of speech: verb
Definition: To make defamatory statements about someone or something.
Example sentence: When you are generalizing, and when your goal is to malign and to say things about an entire group - there are tens of millions of Scientologists in the world - when you decide to blanket statement that 'Scientology is evil,' you are my enemy.