1. A person who advocates for peace, especially one who actively opposes war and military action
The peacenik protesters gathered in front of the government building.
Os pacifistas se reuniram em frente ao prédio do governo.
2. Often used informally or somewhat derogatorily to describe someone with strong anti-war views
He was labeled a peacenik for refusing to support the military campaign.
Ele foi rotulado de pacifista por se recusar a apoiar a campanha militar.