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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.