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unbelievable

[uhn-bi-lee-vuh-buh l] /ˌʌn bɪˈli və bəl/
adjective
1.
too dubious or improbable to be believed:
an unbelievable excuse.
2.
so remarkable as to strain credulity; extraordinary:
the unbelievable fury of the storm; an unbelievable athlete.
Origin
1540-1550
1540-50; un-1 + believable
Related forms
unbelievably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un-believable

unbelievable

/ˌʌnbɪˈliːvəbəl/
adjective
1.
unable to be believed; incredible or astonishing
Derived Forms
unbelievability, unbelievableness, noun
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 un-believable

unbelievable

adj.

1540s, from un- (1) "not" + believable. Related: Unbelievably.

Online Etymology Dictionary, © 2010 Douglas Harper
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