antiwar

/ˌæn(t)iˈwɔr/
/ˌænˌtaɪˈwɔr/

adjective

Opposed to war in general or to the conduct of a specific war.

his speech was interrupted by antiwar protesters

peace-loving,peaceable,pacifist,anti-war,non-violent,non-aggressive,non-belligerent,non-combative,conflict-free,mild,gentle,equable,dovelike,dovish