The adjective untoward describes something offensive or inappropriate, like the rumors of untoward behavior that can shatter a Hollywood icon's reputation.
Untoward also describes things that are not good for you, such as untoward advice from someone your parents always said was a bad influence. Think about what you do when you move toward something: you get closer to it. Suppose you're moving toward a goal. You are, as they say, "on the right path." But when you add the prefix un- you reverse that, and you're no longer on the path to that goal — you're untoward.