Which term best describes the illegal or immoral actions that void a contract?

The term that best describes the illegal or immoral actions that void a contract is "Illegality." In contract law, a contract is considered void if it involves activities or agreements that are illegal or against public policy. This could involve agreements related to unlawful activities such as drug trafficking, fraud, or anything that violates the law. Since contracts require a lawful purpose to be enforceable, any form of illegality fundamentally undermines the validity of the contract, rendering it unenforceable in a court of law.

While "Involuntary actions" can refer to circumstances where consent is not freely given, it does not specifically address the illegality of the contract's subject matter. Similarly, "Duress" involves situations where one party is forced into a contract against their will, affecting consent rather than the legality of the contract itself. An "Infraction" refers to a minor violation of a rule or law, which, while possibly related to wrongful actions, does not encompass the broader concept of illegality that would void a contract. Thus, Illegality is the most accurate term to describe actions that make a contract void.