Descriptive:
* The view from the mountaintop was unbelievable, with snow-capped peaks stretching as far as the eye could see.
* The magician's tricks were so unbelievable that the audience gasped in amazement.
* Her resilience in the face of adversity was unbelievable.
Expressing disbelief:
* "You won the lottery? That's unbelievable!"
* I can't believe it's already December! It feels unbelievable how fast time flies.
* It's unbelievable that they could treat someone like that.
Figurative:
* The rumors about their relationship were unbelievable, completely unfounded.
* He told an unbelievable story about his adventures in the Amazon rainforest.
Remember:
* "Unbelievable" can be used to express both positive and negative feelings.
* It's important to consider the context and tone when using the word.