undue

This word carries a strong sense of imbalance, specifically when something is pushed beyond a natural or legal limit. It is frequently used in formal, legal, or professional settings to describe influence or hardship that is unfair or disproportionate to the situation. While "excessive" simply means too much, "undue" implies a lack of justification or a violation of a standard. It suggests that the amount of effort, stress, or influence applied is not only too high but is morally or logically wrong for the specific context.