Someone who refuses to resort to violence in order to solve a problem.

a person with the right idea
don't hurt other people
don't kill other people
just go through life with smiles and laughs and never hit someone else
we all learned that in kindergarden
pacifists are the only ones who remember
violence just leads to death and jail

Someone who, for religious, ethical, practical, or other reasons, believes that violence and/or war are not acceptable solutions to problems.

Common English definition: someone who believes in non-violent solutions to the world's problems and that war is a crime against humanity

American definition: terrorist

A brotha who believes that even playa-hatin' nations shouldn't have caps busted in they asses.

Someone with the nutty idea that killing people is wrong.

A person who believes that anything goes, including murder, just so long as it isn't them who does the killing. Pacifists will snitch to police, set people up, steal, lie, cheat, screw your boyfriend/girlfriend, and instigate fights between non-pacifists. Pacifists tend to be very self-righteous types, smug, snooty, and elitist. They tend to live in a dream world that they can get away with this sort of crap forever and that nobody will wise up and crush them with a steamroller. They are wrong.