A nonbeliever is someone who does not accept a particular set of beliefs or doctrines. A DETRACTOR is someone who speaks negatively about something, a DISBELIEVER is someone who does not believe in something, a misanthrope is someone who dislikes people, an AGNOSTIC is someone who believes that the truth of certain claims, especially religious or metaphysical ones, are unknown and unknowable, a PESSIMIST is someone who expects the worst, a DOUBTER is someone who questions the truth of something, a CYNIC is someone who believes that people are motivated by self-interest, an INFIDEL is someone who does not accept a particular religion, a SKEPTIC is someone who questions the truth of something, a HERETIC is someone who goes against accepted beliefs, a HEATHEN is someone who does not follow a particular religion, an ATHEIST is someone who does not believe in any gods, and a PAGAN is someone who follows a polytheistic religion.