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
Bai	-	Chinese
YİĞİT	yee-YEET	Turkish
Raguel	ray-GYOO-əl (English)	Judeo-Christian Legend
Noelani	-	Hawaiian
GabrielĖ	-	Lithuanian
Romanus	-	Late Roman