Adjective demonstrable has 2 senses
  1. demonstrable, incontrovertible - necessarily or demonstrably true; "demonstrable truths"
    Antonym: contestable (indirect, via incontestable)
  2. 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)
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