1. Meticulously done or crafted.
2. Painstakingly taken care of, elegantly maintained.
3. Elegantly simple.
4. Well-groomed, dressed with great care and elegance.
5. Modish, sleek.
This comes from the past participle of the French verb soigner, meaning 'to take care of'. It can be spelled soigne, soigné, soignee, or soignée. It is pronounced swah-NYAY or swan-YAY.