Longman Dictionary of Contemporary English homepage

unbelievable

 adjective
     
un‧be‧liev‧a‧ble S3
1 very good, successful, or impressive [= amazing]:
The opportunities are unbelievable.
an unbelievable talent
2 very bad or shocking [= terrible]:
The pain was unbelievable.
acts of unbelievable cruelty
It was unbelievable that we were expected to pay twice.
3 so extreme that it hardly seems possible:
He's so lazy it's unbelievable.
an unbelievable speed
4 very difficult to believe and therefore probably untrue:
Yvonne's excuse for being late was totally unbelievable.
—unbelievably adverb:
an unbelievably bad movie
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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