Misinform :: Misinform (v. i.) To give untrue information; (with against) to calumniate.
Misinformer :: Misinformer (n.) One who gives or incorrect information.
Overinform :: Overinform (v. t.) To inform, fill, or animate, excessively..
Well-informed :: Well-informed (a.) Correctly informed; provided with information; well furnished with authentic knowledge; intelligent.