rumormongering

/ˈrumərˌmʌŋɡərɪŋ/
noun
  1. The act of spreading rumors or unverified information, often with the intent to cause harm or stir up trouble.
    • The politician accused the media of rumormongering to damage his reputation.
    • The school had to address the rumormongering that was causing bullying among students.
    • Rumormongering in the office created a lot of unnecessary tension among coworkers.