ETYMOLOGY
from mis- (wrong, unfavourably) + proud
EXAMPLE 1
“…Ȝyf a man haue mysdo or seyde,
And men hym blame for þat mysbreyde,
Ȝyf he susteynë hys mysdede,
And hys mysawe wyl nat drede,
Þat cumþ of mysprout herte and hy
Þat wyl nat knowe hys owne foly…”
From: Robert of Brunne’s “Handlyng Synne” (Harley MS)
By Robert Mannyng, a1400
EXAMPLE 2
“…It was in 1397, ninety years since the first assertion of Swiss independence, when Leopold the Handsome, Duke of Austria, a bold but misproud and violent prince, involved himself in one of the constant quarrels with the Swiss that were always arising on account of the insulting exactions of toll and tribute in the Austrian border cities…”
From: A Book of Golden Deeds of All Times and All Lands
By Charlotte Mary Yonge, 1864
Lexicophilia 