1. difficult or impossible to believe; not credible
2. extremely impressive or remarkable
Usage: informal

Examples

• His story about meeting a celebrity was completely unbelievable.
• The witness gave an unbelievable account of the events.
• She has unbelievable talent as a musician.
• The view from the mountain top was unbelievable.
• It’s unbelievable how much the city has changed.
• The team’s comeback victory was absolutely unbelievable.
• I find it unbelievable that he would lie about something so important.