14 letters · 25 points in Scrabble
noun total certainty or greater certainty than circumstances warrant
originEtymology tree Proto-Indo-European *úp Proto-Indo-European *-er Proto-Indo-European *upér Proto-Germanic *uber Old English ofer- Middle English over- English over- English confidence English overconfidence From over- + confidence.
Etymology from Wiktionary, CC BY-SA 3.0