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incredible

[in-kred-uh-buh l]
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adjective
  1. so extraordinary as to seem impossible: incredible speed.
  2. not credible; hard to believe; unbelievable: The plot of the book is incredible.

Origin of incredible

First recorded in 1375–1425; late Middle English word from Latin word incrēdibilis. See in-3, credible
Related formsin·cred·i·bil·i·ty, in·cred·i·ble·ness, nounin·cred·i·bly, adverb
Can be confusedincredible incredulous

Synonyms

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2. farfetched, astonishing, preposterous.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for incredibly

incredible

adjective
  1. beyond belief or understanding; unbelievable
  2. informal marvellous; amazing
Derived Formsincredibility or incredibleness, nounincredibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for incredibly

incredible

adj.

early 15c., "unbelievable," from Latin incredibilis "not to be believed," from in- "not" (see in- (1)) + credibilis "worthy of belief" (see credit). Used c.1400 in a now-extinct sense of "unbelieving, incredulous." Related: Incredibly.

Online Etymology Dictionary, © 2010 Douglas Harper