Formal:
* Magnificent: Emphasizes grandeur and impressive scale.
* Exemplary: Highlights the quality of being a perfect example.
* Exceptional: Focuses on exceeding expectations.
* Outstanding: Signifies something that stands out from the ordinary.
* Remarkable: Implies something worthy of attention and comment.
Informal:
* Rad: A more casual and youthful alternative.
* Brilliant: Highlights intelligence or cleverness.
* Fantastic: Expresses a high degree of enjoyment or excitement.
* Amazing: Conveys surprise and wonder.
* Incredible: Highlights disbelief or astonishment.
* Superb: Emphasizes excellence or high quality.
* Terrific: Expresses strong positive feelings.
* Phenomenal: Highlights something unusual or extraordinary.
* Mind-blowing: Focuses on something that is overwhelming or intellectually stimulating.
* Epic: Implies something grand in scope or scale.
* Kick-ass: A more informal and energetic alternative.
Other options:
* Breathtaking: Emphasizes beauty or awe-inspiring qualities.
* Splendid: Expresses elegance and magnificence.
* Dazzling: Highlights brilliance or captivating qualities.
* Exceptional: Signifies something that stands out from the ordinary.
* Stellar: Emphasizes excellence or top-notch quality.
Ultimately, the best word to use depends on the specific context and the feeling you want to convey.