Cocksure

Confidently certain; without doubt or fear. (Vulgar.) "I thought myself cocksure of his horse, which he readily promised me."- Pope . Cockswain, ( koks'n ,) n. [Cog, or cock , a small boat, and swain , a boy, a servant.] ( Naut .) An officer on board a ship, who has charge of a boat and crew; as, the captain's cockswain.- The person who steers, and directs the course of a row-boat.