See more synonyms for misthink on Thesaurus.com
verb (used with object), mis·thought, mis·think·ing.
  1. to think unfavorably or ill of.

Origin of misthink

First recorded in 1175–1225, misthink is from the Middle English word misthenken. See mis-1, think1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for misthink

Old English misðyncan "to be mistaken;" see mis- (1) + think (v.). From early 13c. as "to have sinful thoughts;" from 1590s as "to think ill of."

Online Etymology Dictionary, © 2010 Douglas Harper