According to one's own admission: a self-confessed plagiarist. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "self-confessed" in a sentence
"talk show host, criticizing the American and European media for labeling self-confessed Norwegian terrorist Anders Behring-Breivika as a Christian extremist, despite the killer's multiple oral and written claims to believe in Christianity"
"I won't comment on his self-confessed psychological flaws as that would force me to include similar comments on that other nutter, Derek Draper."
""The 'work hard, get good grades and go to college to get a job' mantra is dead," says twenty-something self-confessed hustler Scott Gerber, author of Never Get a "Real" Job: How To Dump Your Boss, Build a Business and Not Go Broke (Wiley, December 2010)."