Undue influence

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(Law) any improper or wrongful constraint, machination, or urgency of persuasion, by which one's will is overcome and he is induced to do or forbear an act which he would not do, or would do, if left to act freely.
- Abbott.

See also: Undue

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
"Can we declare that he acted under undue influence; or, in plainer terms, under the influence of Mrs.
Not only many of the officers of government, who obeyed the dictates of personal interest, but others, from a mistaken estimate of consequences, or the undue influence of former attachments, or whose ambition aimed at objects which did not correspond with the public good, were indefatigable in their efforts to pursuade the people to reject the advice of that patriotic Congress.
What a blessing it is, when undue influence does not survive the grave!
He had availed himself, in this heavy undertaking, of the experience of a certain wandering eastern mechanic, who, by exhibiting a few soiled plates of English architecture, and talking learnedly of friezes, entablatures, and particularly of the composite order, had obtained a very undue influence over Richard’s taste in everything that pertained to that branch of the fine arts.
Middleton, jealous of his own consideration no less than of the authority of his government, suspected some undue influence on the part of the agents of the Canadas; and, as he was determined to maintain the authority of which he was the representative, he felt himself constrained to manifest a hauteur, that he was far from feeling.
"That she would have--that it is a case of undue influence. No, to my mind the question is the--the invalid's condition at the time she wrote."
Langan, Snell's Principles of Equity (Sweet & Maxwell, 28th ed, 1982) 544, where Tate v Williamson wishfully was cited for the proposition that 'the principles of undue influence and abuse of confidence overlap but do not coincide'.
Perhaps Steve and Sunday People Sport has undue influence at the Etihad.
When elderly clients begins making radical changes to their estate plan, most planners begin wondering whether they're truly making those decisions on their own, or whether they're the victim of undue influence.
Testamentary incapacity, undue influence, and insane delusions are recurring doctrines in the context of an impaired, weakened, or confused individual leaving a will, the validity of which comes under question.
That she was subjected to undue influence in the making of the relevant Wills and Codicils; and
Due to being relatively well-off they are accused of having undue influence in the Buddhist-majority country.