Self-evident facts are statements that are easily understood and require no further explanation. Synonyms for this phrase include obvious truths, axioms, undeniable facts, and indisputable realities. These terms all describe ideas that are widely accepted and universally understood. Other synonyms for self-evident facts include common knowledge, established principles, and fundamental beliefs. Regardless of the term used, these facts are considered to be self-evident because they require no proof or evidence to support them. They are simply understood to be true, and are often used as the basis for further reasoning and argumentation.