Antiwar (adjective)

1. Opposed to war or military conflict.
2. Favoring peace and the avoidance of war.

Origin:

Mid 20th century: from anti- + war.

Examples:

1. The antiwar movement organized protests against the military action.
2. The antiwar sentiment was strong among the public.
3. The antiwar activist spoke out against the government's policies.
4. The antiwar film depicted the devastating impact of war on innocent civilians.
5. The antiwar demonstration attracted thousands of people who wanted to show their opposition to the war.