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English definition of “unbelievable”

unbelievable

adjective [not gradable] (SURPRISING)   /ˌʌn·bɪˈli·və·bəl/
extremely surprising: That little dog eats an unbelievable amount of food. unbelievably    /ˌʌn·bɪˈli·və·bli/ adverb [not gradable] It was unbelievably stupid of you to go.
(Definition of unbelievable adjective (SURPRISING) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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