"erroneous judgment," 1520s, from mis- (1) "bad, wrong" + judgment.
Entries linking to misjudgment
mis- 1
prefix of Germanic origin affixed to nouns and verbs and meaning "bad, wrong," from Old English mis-, from Proto-Germanic *missa- "divergent, astray" (source also of Old Frisian and Old Saxon mis-, Middle Dutch misse-, Old High German missa-, German miß-, Old Norse mis-, Gothic missa-), perhaps literally "in a changed manner," and with a root sense of "difference, change" (compare Gothic misso "mutually"), and thus possibly from PIE *mit-to-, from root *mei- (1) "to change."
Productive as word-forming element in Old English (as in mislæran "to give bad advice, teach amiss"). In 14c.-16c. in a few verbs its sense began to be felt as "unfavorably," and it came to be used as an intensive prefix with words already expressing negative feeling (as in misdoubt). Practically a separate word in Old and early Middle English (and often written as such). Old English also had an adjective (mislic "diverse, unlike, various") and an adverb (mislice "in various directions, wrongly, astray") derived from it, corresponding to German misslich (adj.). It has become confused with mis- (2).
judgment n.
mid-13c., jugement, "action of trying at law, trial," also "capacity for making decisions," from Old French jugement "legal judgment; diagnosis; the Last Judgment" (11c.), from jugier "to judge" (see judge (v.)).
From late 13c. as "penalty imposed by a court;" early 14c. as "any authoritative decision, verdict in a court case." From late 14c. in reference to the final trial of the human race in a future state (Judgment Day attested from late 14c.). Also from c. 1300 as "opinion." Sense of "discernment" is first recorded 1530s. By 1610s as "a divine allotment, event regarded as an expression of divine displeasure."