Infallibilist is a term that refers to someone who believes in the concept of infallibility, or in other words, a person who believes that something is always true or correct. Some synonyms for this term include dogmatist, absolute believer, and unwavering supporter. Other related words include certitude, conviction, and faith. Infallibilists can be found in various fields, including politics, religion, and science, where they hold their beliefs with utmost certainty. However, it is important to note that this type of thinking can sometimes lead to closed-mindedness and an inability to consider alternative perspectives.