What is the primary characteristic of a void contract?

A void contract is defined as an agreement that is not legally enforceable. This means that it lacks the legal validity necessary to be recognized by the law. In practical terms, a void contract is treated as though it never existed, which can occur for various reasons, such as illegality, lack of capacity of one party, or because it involves terms that are impossible to fulfill.

In contrast, a legally approved contract is enforceable and recognized by the law, which does not apply to a void contract. A contract characterized by significant mutual consent is typically valid if all essential elements are met, including capacity, legal purpose, and mutual agreement. Additionally, a void contract itself cannot be modified by the parties involved because it is not recognized as a legitimate contract in the eyes of the law.

Thus, the primary characteristic that clearly defines a void contract is that it is not enforceable by law, confirming the selection of the correct answer.