peacenik

/ˈpiːs.nɪk/
noun
  1. A person who is strongly opposed to war and actively promotes peace, often used in an informal or slightly disapproving way.
    • Some people called her a peacenik because she always spoke out against military action.
    • The documentary followed a group of peaceniks who traveled to conflict zones to promote nonviolence.
    • My uncle was a peacenik in the 1960s and marched in several anti-war protests.
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