The word "antiwar" refers to a person or thing that is against war. There are several synonyms for "antiwar" which include "pacifist", "dovish", and "peaceful". A pacifist is someone who believes that war and violence are wrong and supports peaceful ways of resolving conflicts. Those who are dovish are averse to war or any kind of strife. Finally, the word "peaceful" means being free from disturbance or violence, which is the state of being that antiwar advocates usually promote. Regardless of the word used, the message is clear - the person or thing is against war and its destructive effects on people and society.