overweeningness

from The Collaborative International Dictionary of English v.0.48

Overweening \O`ver*ween"ing\, a.
   Unduly confident; arrogant; presumptuous; conceited. --
   {O`ver*ween"ingly}, adv. --Milton. -- {O`ver*ween"ing*ness},
   n.
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         The conceits of warmed or overweening brain. --Locke.
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         Here's an overweening rogue.             --Shak.
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