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inconceivable

[in-kuh n-see-vuh-buh l]
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adjective
  1. not conceivable; unimaginable; unthinkable
  2. unbelievable; incredible.
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Origin of inconceivable

First recorded in 1625–35; in-3 + conceivable
Related formsin·con·ceiv·a·bil·i·ty, in·con·ceiv·a·ble·ness, nounin·con·ceiv·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for inconceivable

inconceivable

adjective
  1. incapable of being conceived, imagined, or considered
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Derived Formsinconceivability or inconceivableness, nouninconceivably, 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 inconceivable

adj.

1630s, from in- (1) "not, opposite of" + conceivable. Related: Inconcievably. An Old English word for this was unasmeagendlic.

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Online Etymology Dictionary, © 2010 Douglas Harper