Usually means: Cannot be resolved by computation.
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We found 8 dictionaries that define the word undecidable:

General (7 matching dictionaries)
  1. undecidable: Merriam-Webster
  2. undecidable: Oxford Learner's Dictionaries
  3. undecidable: Collins English Dictionary
  4. undecidable: Wordnik
  5. undecidable: Wiktionary
  6. undecidable: Webster's 1828 Dictionary
  7. undecidable: FreeDictionary.org

Science (1 matching dictionary)
  1. Undecidable: Eric Weisstein's World of Mathematics

Definitions from Wiktionary (undecidable)

adjective:  (mathematics, computing theory) 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.
adjective:  (mathematics) (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.)

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