intended to be helpful but in fact making a situation worse:
He described the government's economic policy as misguided.
a misguided attempt to bring her parents back together
a misguided idea or opinion is wrong because it is based on a wrong understanding of a situation:
His parents still clung to the misguided belief that his common sense would keep him out of serious trouble.
The company misguidedly thought that expansion was the best way to survive.