Definition of unbelievable adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌʌnbɪˈliːvəbl//
    ; NAmE NAmE//ˌʌnbɪˈliːvəbl//
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  1. 1(informal) 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 get 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.
  3. Extra examples I find this quite unbelievable. It’s simply unbelievable to me. I found the ending of the novel a bit unbelievable. I’ve had three unbelievable years with the team. It seemed unbelievable, but it was true. It whizzed through the air at an unbelievable speed. It’s all so unbelievable! It’s an unbelievable place to spend the summer. It’s unbelievable that he was allowed to escape. The collapse of the company would have been thought completely unbelievable only a few months ago. The murders were carried out with unbelievable brutality. The pain was unbelievable. The stress on the family is unbelievable. Unbelievable or not, it happened.
See the Oxford Advanced American Dictionary entry: unbelievable