definition of mental duress:
the use of threats or other forms of psychological coercion, done to induce another to act against his or her will. Mental duress is frequently an issue in contracts which, by law, require all parties to act on their own initiative. While the law varies between jurisdictions, generally speaking, any agreement is void if it can be shown that mental duress was used in the contracting process. Agreement by definition requires a meeting of the minds.
mental duress, as it might be used:
After enduring prolonged verbal abuse and in a state of mental duress the elderly woman signed the forms.