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inconceivable

[in-kuh n-see-vuh-buh l] /ˌɪn kənˈsi və bəl/
adjective
1.
not conceivable; unimaginable; unthinkable.
2.
unbelievable; incredible.
Origin of inconceivable
1625-1635
1625-35; in-3 + conceivable
Related forms
inconceivability, inconceivableness, noun
inconceivably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for inconceivable

inconceivable

/ˌɪnkənˈsiːvəbəl/
adjective
1.
incapable of being conceived, imagined, or considered
Derived Forms
inconceivability, inconceivableness, noun
inconceivably, 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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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22
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