misguided

(verb) lead someone in the wrong direction or give someone wrong directions. Synonyms: mislead, misdirect, misguide, lead astray. Examples: "The pedestrian misdirected the out-of-town driver."

(verb) give bad advice to. Synonyms: misadvise, misguide.

(adj) poorly conceived or thought out. Synonyms: ill-conceived. Examples: "An ill-conceived plan to take over the company."

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