-ēv verb
Etymology: Middle English misbileven, misbeleven, from mis- (I) + bileven, beleven to believe — more at believe
intransitive verb
obsolete : to hold a belief or doctrine thought to be false or unorthodox
chide at him that made her misbelieve — Edmund Spenser
transitive verb
archaic : disbelieve
some people … misbelieve I was ever married — Robert Grant †1940