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English definition of “unbelievable”

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unbelievable

adjective uk   /ˌʌn.bɪˈliː.və.bl̩/ us  

unbelievable adjective (SURPRISING)

B1 extremely surprising: She eats an unbelievable amount of food. You've had such bad luck it's unbelievable. You should see her wardrobe - it's unbelievable - she's got about 50 pairs of shoes.
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unbelievable adjective (UNLIKELY)

B2 unable to be believed because unlikely: I found most of the characters in the play totally unbelievable.
(Definition of unbelievable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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