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English definition of “unbelievable”

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unbelievable

adjective  /ˌʌn·bɪˈli·və·bəl/ us  

unbelievable adjective (SURPRISING)

[not gradable] extremely surprising: That little dog eats an unbelievable amount of food.

unbelievable adjective (UNLIKELY)

not able to be believed because unlikely: an unbelievable story/excuse unbelievable luck
unbelievably
adverb [not gradable]  /ˌʌn·bɪˈli·və·bli/ us  
It was unbelievably stupid of you to go.
(Definition of unbelievable from the Cambridge Academic Content Dictionary © Cambridge University Press)
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