Un-beliefs are concepts that are contrary to established beliefs or faith-based beliefs. There are several synonyms to the word 'un-beliefs' that can be used depending on the context. Some of the alternative words are skepticism, doubt, disbelief, suspicion, misgiving, incredulity. Skepticism is a mindset that seeks evidence before accepting any claim. Doubt implies a lack of certainty about something. Disbelief refers to a rejection of a certain claim or belief. Suspicion indicates a mistrust of a certain idea. Misgiving implies a feeling of uneasiness or doubt about a belief. Incredulity means a refusal to believe events or claims that seem implausible.