Summing up the case in the Supreme Court, Mr Justice Cato said Tevita Vaka was unrepentant and there was little prospect of him being rehabilitated.
Kaniva News reports Vaka, 28, was taken to the United States by his natural mother when he was young, but returned in 2009.
He almost immediately offended and was sentenced to two years suspended.
Six years later he became involved in a series of violent and pre-meditated attacks and robberies.
Earlier this year he was sentenced to six years for the assault and robbery of a restaurant owner and his wife.
