Ipsedixitism is a term that refers to a dogmatic declaration without any evidence to support it. Some synonyms for ipsedixitism include assertion, declaration, dictum, opinion, and proclamation. Other similar terms can include statement, affirmation, pronouncement, and belief. These words all refer to a strong and confident expression of one's opinion or belief without necessarily providing any concrete evidence to support it. Whether expressed with conviction or simply stated as a passing thought, these words all convey a strong sense of certainty about a particular point of view, despite any evidence to the contrary.