IPA: //ˌsuːpərˈkɒnfɪdənt//
KK: /suːpərˈkɒnfɪdənt/
Having a very high level of confidence in oneself or one's abilities.
She walked into the room superconfident, ready to give her presentation.
Superconfident → It is formed from "super-" (meaning above or beyond) and "confident" (from Latin "confidere", meaning to trust or have full trust). The word "superconfident" means having an excessive or extreme level of confidence, going beyond normal trust in oneself.
Think of 'super-' meaning 'above' and 'confident' meaning 'trusting' — so superconfident means trusting yourself to an extreme degree.