B1
extremely bad or good and making you feel surprised
Dictionary examples:
The pizza was so big, it was unbelievable. It covered the whole table! (0.0)
The traffic was so bad, it was unbelievable. Even snails were passing us! (0.0)
It's unbelievable! My cat learned to use the toilet overnight. (0.0)
It's unbelievable how lucky she's been. (28.4)
You've had such bad luck - it's unbelievable. (51.6)