The Collaborative International Dictionary
Overweeningness
Overweening \O`ver*ween"ing\, a.
Unduly confident; arrogant; presumptuous; conceited. --
O`ver*ween"ingly, adv.
--Milton. -- O`ver*ween"ing*ness,
n.
The conceits of warmed or overweening brain.
--Locke.
Here's an overweening rogue.
--Shak.
Wiktionary
overweeningness
n. The quality of being overweening.