The term could be virtuoso. A young person may be a prodigy.
A multi-talented person is a polymath.
Exceptionally is an adverb, describing talented. Talented is an adjective. Very few word pairs are considered compound adverbs.
One possible substitute for "their" is "his" or "her" depending on the gender of the person/people being referred to. Another substitute can be "its" when referring to a non-human object or entity.
A very talented artist in all sorts of syles. Verry talented and creative in lot of ways.
The word is optimist.(A person who is negative is a pessimist.)
An invalid
Talented Hands or Gifted Hands This is usually a phrase used for a person who is very talented in cooking tasty or flavoursome food or also for talent in any skill like gardening, plumbing etc.
The word that works is idiot.
One word is reprobate.
The word could be "nitpicker."
The word is busybody.
talented tiresome terrific tremendous