misconceit1
/ˌmɪskənˈsiːt/noun
Misconception, misunderstanding.
Origin
Late Middle English. From mis- + conceit.
misconceit2
/ˌmɪskənˈsiːt/Now rare (archaic in later use)
verb
[with object] To have or form a wrong conception or false idea of; to think mistakenly that something is the case.
Origin
Late 16th century; earliest use found in Emanuel Forde (fl. 1585–1599), romance writer. From mis- + conceit.