undecidable

[dih-sahy-duh-buhl]

de·cid·a·ble

[dih-sahy-duh-buhl]
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

de·cid·a·bil·i·ty, noun
un·de·cid·a·ble, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Undecidable is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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