defame

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Defame, abuse, harass, stalk, threaten or otherwise violate the legal rights (such as rights of privacy and publicity) of others;
诽谤、辱骂、骚扰、跟踪、威胁或以其他行为侵犯他人的合法权益（如隐私权和公开权）;
They frequently harass their victims by contacting their friends, colleagues, online contacts, etc., to either defame them or to gain pertinent information about their personal and professional lives.
他们通过不断的联系他们的朋友，同学，在线联系人等等或是诽谤他们或者是获取他们个人和职业生涯相关的信息，给受害者造成麻烦。
Opposition parties have been forbidden to “use words or facts that defame other politicians”.
反对党被禁止使用诋毁其他政客的言论。

Other past governments also imposed media controls. In addition, Thailand's strict lese majeste laws, aimed at protecting the revered monarchy, make it illegal to say or publish anything deemed to defame the monarchy.

At this point, the freedom to defame is stronger than the protections against defamation.
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According to Shariah, it is impermissible to engage in speech or writings that "defame" Islam or otherwise offend its followers.
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Using former drivers who were forging signatures on invoices and hiding their lost business as sources to defame Cintas is deplorable.
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to damage the reputation of a person or group by saying or writing bad things about them that are not true

If someone defames another person or thing, they say bad and untrue things about them.