- demonstrable, incontrovertible - necessarily or demonstrably true; "demonstrable truths"
Antonym: contestable (indirect, via incontestable)
- demonstrable, provable - capable of being demonstrated or proved; "obvious lies"; "a demonstrable lack of concern for the general welfare"; "practical truth provable to all men"- Walter Bagehot
Antonym: unobvious (indirect, via obvious)