Undue influence is a term used to describe the unfair pressure someone exerts on another person to make them act or behave in a certain way. Synonyms for this term include coercion, intimidation, manipulation, persuasion, and pressure. These words all describe the act of one person forcing another to do something that they would not have done otherwise. Coercion and intimidation often involve the threat of physical harm or harsh consequences, while manipulation, persuasion, and pressure rely on more subtle and indirect techniques. Regardless of the method used, undue influence is never ethical or justifiable, and efforts should be made to resist or avoid it whenever possible.