No, "undue" is not a preposition. It is an adjective used to describe something that is excessive or unwarranted.
undue reliance
Undue
Duress and undue influence are pressure put on someone to do what is being requested of them against their best wishes
Undue prejudice is when the defendant is not able to get a fair trial. Undue prejudice can occur when there is a lot of media coverage, or the jury has been turned against a defendant because of the nature of the crime he is accused of.
is not allowed
Factors such as undue influence and fraud can have a HUGE effect on a will. More specifically if either of those elements are proved then it can serve to invalidate that portion relation to the undue influence or fraud or completely invalidate the entire will. Undue influence and fraud most often arise when a person is drafting a will or entering into a contract. Courts will find that someone drafting a will was subject to undue influence if they gave into the pressure and did not make the will based on their actual intentions.
2 and 4
Yes, indeed, it is. All other stress is due.
No, it is an adverb. The adjective form is undue.
True Confessions - 1985 Undue Pressure 042 was released on: USA: 15 October 1986
Coercion is forcing someone to something they don't want to do. Undue influence is when a more powerful person takes advantage of another person.