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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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.
This group has over 3,000 followers and they werent just following her cancer diagnosis, they were following her positivity and pure incredibleness of looking fear in the face and showing the world that while cancer might beat your body, it will never, ever beat your spirit or soul.
That action, which is obviously incredible, has even more incredibleness when that person is 37 years old instead of 85 years old," he shared.