Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR MORE COCKSURE

He was more cocksure and conceited than ever before, and more prone to brag and bully.

WORD ORIGIN

1520s, "certain," from cock (n.1) + sure (adj.). Probably "as assured as a cock." "The word was originally perfectly dignified, and habitually used in the most solemn connexions" [OED].

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.