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1. So implausible as to elicit disbelief; unbelievable: gave an incredible explanation of the cause of the accident.
2. Astonishing, extraordinary, or extreme: dressed with incredible speed.

[Middle English, from Latin incrēdibilis : in-, not; see in-1 + crēdibilis, believable; see credible.]

in·cred′i·bil′i·ty, in·cred′i·ble·ness n.
in·cred′i·bly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.incredibleness - the quality of being incredible
quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
implausibility, implausibleness - the quality of provoking disbelief
References in classic literature ?
So I don't think any of us said very much about time travelling in the interval between that Thursday and the next, though its odd potentialities ran, no doubt, in most of our minds: its plausibility, that is, its practical incredibleness, the curious possibilities of anachronism and of utter confusion it suggested.
Once created, fans have the option of sharing their incredibleness with friends via Facebook, Twitter and LinkedIn.
You'll be able to express your incredibleness in all its ragin" glory.