misproud
Unduly or unwarrantably proud or vain; wrongly proud; arrogant; haughty.
archaic
It is grete scorne to se a mysproude knave / With a clerke that connynge is to prate: / Lete theym go lowse theym, in the devylles date.
Where it comes from
From Middle English misproud, equivalent to mis- + proud.
Adapted from the Wiktionary entry misproud (CC BY-SA 4.0).