undecidable

adjective
un·​de·​cid·​able | \ˌən-di-ˈsī-də-bəl \

Definition of undecidable 

: not capable of being decided : not decidable … a huge popular audience, most of whom must have been baffled and exasperated by its elaborate and undecidable mystifications.— David Lodge deconstruction, which teaches that literature is essentially "undecidable," beyond interpretation …— James Atlas To be complete such a system must be able to prove that any formula expressible in its language (a mathematical equation, for example, or a statement in symbolic logic) is either true or false; nothing can be undecidable.— George Johnson

Other Words from undecidable

undecidability \ ˌən-​di-​ˌsī-​də-​ˈbi-​lə-​tē \ noun

First Known Use of undecidable

1640, in the meaning defined above

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The first known use of undecidable was in 1640

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