Someone who habitually expects the worst outcome; one who looks on the dark side of things.
The definition of a heretic is a person who violates established rules and tenants of a religion, or is a person who has views that don't conform to the norm.
A cynical person
The definition of a skeptic is someone inclined to doubt or question rather than just believe matters that are generally accepted.
a person who holds religious beliefs in conflict with the dogma of the Roman Catholic Church
Find another word for misbeliever. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for misbeliever, like: doubter, pessimist, heretic, cynic, skeptic and religious outcast.