Acceptance of an offer by a party influenced under duress or undue influence is enforceable.

The acceptance of an offer by a party influenced under duress or undue influence is not enforceable. When a party is under duress, they are compelled to agree to the terms of a contract through threats or coercion. Undue influence occurs when a party takes advantage of a position of power over another to persuade them to agree to a contract.

In both cases, the essential element of voluntary and informed consent, which is vital for a contract to be valid, is absent. Contracts made under such circumstances lack the mutual assent that is a fundamental component of contract law. Therefore, if a party's acceptance stems from undue influence or duress, the law typically allows for the option to rescind the contract, making it unenforceable. This principle is designed to protect individuals from being bound to agreements they did not willingly and freely enter into, maintaining fairness and justice in contractual dealings.