• synonyms


[in-kuh n-see-vuh-buh l]
  1. not conceivable; unimaginable; unthinkable
  2. unbelievable; incredible.
Show More

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

Examples from the Web for inconceivably

Historical Examples

  • He describes his sensations at this time as inconceivably fearful.

    The Works of Whittier, Volume VII (of VII)

    John Greenleaf Whittier

  • In an inconceivably short time, they were at their own door.

    The Hour and the Man

    Harriet Martineau

  • The sensations were so familiar that the recognition was inconceivably rapid.

  • What mind sufficient to balance extremes so inconceivably immense?

    Thoughts on Missions

    Sheldon Dibble

  • Suddenly, brilliantly, inconceivably, the 'Greys' had won the game.

British Dictionary definitions for inconceivably


  1. incapable of being conceived, imagined, or considered
Show More
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 inconceivably



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

Show More
Online Etymology Dictionary, © 2010 Douglas Harper