J.R.R. Tolkien>
The Silmarillion
The Avari are the group of Elves that refused the summons of the Valar to come to Aman. This is where the name comes from, 'The Unwilling.' Because they remained in the wilds of Middle-Earth, they were probably subject to the evil of Melkor and were the Elves he captured and bred into Orcs. The Avari in later years can sometimes be identified with the Silvan Elves.