What term describes a contract that cannot be enforced in a court of law?

The term that best describes a contract that cannot be enforced in a court of law is "unenforceable contract." An unenforceable contract is one that, due to certain legal reasons, cannot be upheld or enforced by either party. This may arise from factors such as a lack of legal capacity, failure to meet statutory requirements, or situations where the agreement exists but cannot be executed through legal action.

In contrast, a "void contract" refers to an agreement that is not legally valid from its inception, meaning it has no legal effect whatsoever. A "voidable contract," on the other hand, is a valid contract that one party may choose to affirm or void, typically due to issues like misrepresentation or coercion. Lastly, a "valid contract" is one that meets all legal criteria necessary for enforcement. Thus, when considering contracts that cannot be enforced in court specifically, "unenforceable contract" is the most accurate terminology.