Unhelpful (adjective)

1. Not providing or contributing to the achievement of a desired end.
2. Not helpful or supportive.

Origin:

Late 17th century: from un- (expressing negation) + helpful.

Examples:

1. The unhelpful customer service representative only made the problem worse.
2. The unhelpful teacher refused to provide extra help after class.
3. The unhelpful directions only caused more confusion.
4. The unhelpful co-worker wouldn't assist with the project.
5. The unhelpful staff member provided incorrect information.