American English

Definition of unbelievable adjective from the Oxford Advanced American Dictionary

     

    unbelievable

     adjective
    adjective
    NAmE//ˌʌnbɪˈlivəbl//
     
     
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  1. 1 used to emphasize how good, bad, or extreme something is synonym incredible We had an unbelievable (= very good) time in Paris. Conditions in the prison camp were unbelievable (= very bad). We go through an unbelievable amount of food each week. The cold was unbelievable (= it was extremely cold). It's unbelievable that (= very shocking) they have permitted this trial to go ahead.
  2. 2very difficult to believe and unlikely to be true synonym incredible I found the whole story bizarre, not to say unbelievable. opposite believable
unbelievably
 
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NAmE//ˌʌnbɪˈlivəbli//
 
adverb unbelievably bad/good Unbelievably it actually works.
See the Oxford Advanced Learner's Dictionary entry: unbelievable