be cocksure of (oneself)

To be completely certain of oneself or one's actions, to the point of overconfidence. You seem pretty cocksure of yourself—do you really know how to handle that machine?

Common Names:

Name	Pronounced	Usage
Narayana	-	Hinduism, Indian, Kannada, Telugu, Tamil
Vincent	VIN-sənt (English), ven-SAWN (French)	English, French, Dutch, Danish, Swedish, Slovak
Cash	[kæʃ]
Claribel	['kleəribel]
Ender	-	Turkish
Nicolaos	-	Greek