What are the antonyms for DEMONSTRABLE?

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Usage Examples for DEMONSTRABLE

  1. If you ask me whether there exists the least evidence to prove that any form of life can be developed out of matter, without demonstrable antecedent life.... - "The Old Riddle and the Newest Answer" by John Gerard
  2. Whereas by subsequent inquiry he could ascertain as a matter of fact that the watch was due to intelligent contrivance, he could make no such discovery with reference to the marine bay: in the one case intelligent contrivance as a cause is independently demonstrable, while in the other case it can only be inferred. - "Thoughts on Religion" by George John Romanes