un believably

unbelievable

[uhn-bi-lee-vuh-buhl]
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:
1540–50; un-1 + believable

unbelievably, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unbelievable (ˌʌnbɪˈliːvəbəl)
 
adj
unable to be believed; incredible or astonishing
 
unbelieva'bility
 
n
 
unbe'lievableness
 
n

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