General elegance:
* Stylish
* Sophisticated
* Refined
* Graceful
* Classy
* Chic
* Polished
* Tasteful
* Exquisite
* Subtle
For describing people:
* Dignified
* Charming
* Courteous
* Debonair
* Suave
For describing objects or places:
* Opulent
* Luxurious
* Grand
* Magnificent
* Splendid
* Stately
For describing writing or language:
* Fluent
* Articulate
* Well-written
* Concise
* Precise
The best synonym will depend on the specific context in which you are using the word.