INDEMONSTRABLE Synonyms

• not conclusive; not putting an end to doubt or question

• subject to question

• able to be refuted

• lacking or indicating lack of confidence or assurance

• not established beyond doubt; still undecided or unknown

• not established or confirmed

• not certain to occur; not inevitable

• subject to change

• not consistent or dependable

• ambiguous (especially in the negative)

• not convincing

• having a probability too low to inspire belief

• not provable

• (of e.g. evidence) not objective or easily verified

• Not supported by attestation; lacking supporting evidence in the form of assurance from an authority.

• Incapable of being algorithmically decided in finite time. For example, a set of strings is undecidable if it is impossible to program a computer (even one with infinite memory) to determine whether or not specified strings are included.

• (of a WFF) logically independent from the axioms of a given theory; i.e., that it can never be either proved or disproved (i.e., have its negation proved) on the basis of the axioms of the given theory. (Note: this latter definition is independent of any time bounds or computability issues, i.e., more Platonic.)