improper influence that deprives a person of freedom of choice or substitutes another’s choice or desire for the person’s own.
Mental, moral, or physical domination (even if natural or right) that deprives a person of independent judgment and substitutes another person’s objectives in place of his or her own. Exercise of undue influence is characterized often by excessive insistence, superiority of physical power, mind, or will, or pressure applied due to authority, position, or relationship in relation to the strength of the person submitting to it. Consent obtained for a contract, relationship, or transaction is voidable if it can be shown that an unfair advantage has been taken of an involved party.
Undue influence is a recognized legal term described by one resource as, “Virtually any act of persuasion that over-comes the free will and judgment of another, including exhortations, importunings, insinuations, flattery, trickery, and deception, may amount to undue influence.” This term is hundreds of years old and most often used in connection with deathbed changes to wills, but it can also apply to victims of cult indoctrination.