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peacenik

[pees-nik]
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noun Slang: Often Disparaging.
  1. an activist or demonstrator who opposes war and military intervention; pacifist.

Origin of peacenik

An Americanism dating back to 1960–65; peace + -nik
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for peacenik

n.

1962, from peace + -nik. An earlier equivalent was peacemonger (1808).

Online Etymology Dictionary, © 2010 Douglas Harper