I. noun
Etymology: Middle English overwening, from gerund of overwenen
1. obsolete : excessive self-importance, conceit, or arrogance
2. archaic : excessive esteem or estimation
II. adjective
Etymology: Middle English overwening, from present participle of overwenen
1. : unduly confident : arrogant , presumptuous , conceited
have no idea how overweening he would be — S.V.Benét
revolt against an overweening aristocracy — Encyc. Americana
2. : excessive , exaggerated, immoderate , unrestrained
his overweening ambition … has tripped him up — Woodrow Wyatt
overweening greed — H.H.Martin
an overweening love of power — Helen Howe
• over·ween·ing·ness ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ ̷ ̷ noun -es