English

superconfidence

From super- + confidence.

Proto-Indo-European *bʰeydʰ- ‘to trust’

…

Latin fīdō ‘to trust’

Latin cōnfīdō ‘to believe, confide in’

Latin cōnfīdentia ‘assurance, confidence’

Middle English confidence

Today it means

noun Extreme confidence.

Language periods are conventional ranges, not dates for this word.

Etymograph / superconfidence