overweening

adjective

1. presumptuously conceited, overconfident, or proud: a brash, insolent, overweening fellow.
2. exaggerated, excessive, or arrogant: overweening prejudice; overweening pride.

verb (used without object) Archaic.

1. to be conceited or arrogant.

adjective

1. (of a person) excessively arrogant or presumptuous
2. (of opinions, appetites, etc) excessive; immoderate

adj.mid-14c., from present participle of verb overwenen “be conceited, presume, be presumptuous, be over-confident,” from Old English oferwenian “to be proud, become insolent or presumptuous;” see over- + ween.