Formal:
* Вы потрясающие! (Vy potriasayushchie!) - This is a very strong and enthusiastic way to say "You are amazing!" It's appropriate for someone you admire or respect.
* Вы удивительны! (Vy udivitel'ny!) - This translates to "You are amazing!" and is a more neutral and polite way to express admiration.
Informal:
* Ты крутой! (Ty krutoy!) - This is a more casual way to say "You are amazing!" and is often used among friends. It literally translates to "You are cool!"
* Ты классный! (Ty klassny!) - Another informal option, meaning "You are great!"
* Ты невероятный! (Ty neveroyatny!) - This translates to "You are incredible!" and is a very enthusiastic way to express your admiration.
To make it even more specific, you can add a word or phrase:
* Ты удивительно красив! (Ty udivitel'no krasiv!) - "You are incredibly beautiful!"
* Ты невероятно умный! (Ty neveroyatno umny!) - "You are incredibly intelligent!"
* Ты потрясающе талантлив! (Ty potriasayushche talantliv!) - "You are amazingly talented!"
Remember to adjust your choice of words based on the person you are talking to and the context of the situation.