| Adj. | 1. | demonstrable - necessarily or demonstrably true; "demonstrable truths" incontestable, incontestible - incapable of being contested or disputed |
| 2. | demonstrable - 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 obvious - easily perceived by the senses or grasped by the mind; "obvious errors" |