decidable

[dih-sahy-duh-buh l] /dɪˈsaɪ də bəl/
adjective
1.
capable of being decided.
2.
Logic. (of an axiom, proposition, etc.) having the property that its consistency or inconsistency with the axioms of a given logical system is determinable.
Origin
1585-95; decide + -able
Related forms
decidability, noun
undecidable, adjective