Axiomatical is an adjective that describes something which is self-evident or obvious, and therefore accepted as true without needing proof. Synonyms for axiomatical include self-evident, unquestionable, undeniable, irrefutable, and incontestable. These words all suggest that the idea or concept in question is so true and clear that it cannot be disputed or challenged. Other related words include undeniable, absolute, and fundamental. Each of these words emphasizes the strength of the truth behind an idea or concept, acknowledging that it is not just true, but cannot be altered or disputed in any way. Axiomatical, in short, has many synonyms that imply the same level of self-evident truth and profundity.