Meaning of “unbelievable” in the English Dictionary

"unbelievable" in British English

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unbelievableadjective

uk /ˌʌn.bɪˈliː.və.bəl/ us /ˌʌn.bɪˈliː.və.bəl/

(Definition of “unbelievable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unbelievable" in American English

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unbelievableadjective

us /ˌʌn·bɪˈli·və·bəl/

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 ] us /ˌʌn·bɪˈli·və·bli/

It was unbelievably stupid of you to go.

(Definition of “unbelievable” from the Cambridge Academic Content Dictionary © Cambridge University Press)