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unbelievable

 
/ˌʌn·bɪˈli·və·bəl/ adj [not gradable] (SURPRISING)

Definition

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

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