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
Rudesind	-	Ancient Germanic
Ladislao	-	Italian
Anil	-	Hinduism, Indian, Hindi, Marathi, Bengali, Punjabi, Gujarati, Telugu, Kannada, Malayalam, Tamil, Nep
Safi	-	Arabic
Sharon	['ʃærən]
Ronnie	RAH-nee	English