Definitions

1. noun

A person who brings or threatens to bring an action for defamation, especially one who does so maliciously or vexatiously.

“The libellist was eventually found to be in contempt of court for their baseless allegations.”

2. noun

A person who files a lawsuit for defamation, often in a frivolous or malicious manner.

“The celebrity sued the libellist for spreading false rumors about her personal life.”