- incontrovertible, irrefutable, positive - impossible to deny or disprove; "incontrovertible proof of the defendant's innocence"; "proof positive"; "an irrefutable argument"
Antonym: deniable (indirect, via undeniable)
- demonstrable, incontrovertible - necessarily or demonstrably true; "demonstrable truths"
Antonym: contestable (indirect, via incontestable)