Ignorantism is a term that describes the belief or attitude that disregards or rejects knowledge, expertise, or rational thinking. Synonyms for this term include anti-intellectualism, anti-rationalism, obscurantism, irrationalism, and ignorance. Anti-intellectualism refers to the rejection of intellectual reasoning or knowledge, while anti-rationalism is the rejection of logical thinking. Obscurantism is the deliberate obstruction of knowledge and promoting confusion, and irrationalism is a philosophy that rejects reason and some or all of the principles of logic. Finally, ignorance is the lack of knowledge or information about a particular subject matter. These synonyms all denote a similar disdain for knowledge and a lack of commitment to rationality and truth-seeking.