General synonyms:
* Talented
* Able
* Skilled
* Adept
* Proficient
* Capable
* Aptitudes
* Bright
* Smart
* Clever
* Genius
* Exceptional
* Outstanding
* Remarkable
* Extraordinary
More specific synonyms:
* Artistic: Artistic, creative, inspired
* Academic: Intellectual, scholarly, brilliant
* Musical: Musical, harmonious, melodious
* Athletic: Athletic, strong, agile
* Verbal: Eloquent, articulate, fluent
Informal synonyms:
* Natural
* Whizz
* Wonderkid
* Brainiac
* Savvy
* Sharp
Formal synonyms:
* Endowed
* Blessed
* Possessed
* Endowed
The best synonym to use will depend on the specific context and the tone you want to convey.