n. Conceit; arrogance. Milton. [ 1913 Webster ]
a. Unduly confident; arrogant; presumptuous; conceited. -- O`ver*ween"ingly, adv. Milton. -- O`ver*ween"ing*ness, n. [ 1913 Webster ]
The conceits of warmed or overweening brain. Locke. [ 1913 Webster ]
Here's an overweening rogue. Shak. [ 1913 Webster ]