mistaken

(verb) identify incorrectly. Synonyms: mistake, misidentify. Examples: "Don't mistake her for her twin sister."

(verb) to make a mistake or be incorrect. Synonyms: err, mistake, slip.

(adj) wrong in e.g. opinion or judgment. Synonyms: misguided. Examples: "Well-meaning but misguided teachers." "A mistaken belief." "Mistaken identity."

(adj) arising from error. Synonyms: false. Examples: "A false assumption." "A mistaken view of the situation."