Which type of contract does not require a written document to be enforceable?

Implied contracts are agreements that are not explicitly stated but are inferred from actions, conduct, or circumstances of the parties involved. These contracts are enforceable without a written document because they arise from the mutual intentions of the parties, even if no formal agreement was explicitly articulated. For instance, if you go to a restaurant and order food, there is an implied contract that you will pay for the meal after it is served.

While verbal contracts can also be enforceable, they are often subject to disputes regarding terms since oral agreements can be difficult to prove. Executed contracts refer to agreements that have been fully performed by all parties involved and thus do not pertain specifically to the need for written documentation. Contracts of adhesion are typically standard form contracts that one party drafts, leaving little room for negotiation, and while they often do not require signatures, enforceability may still depend on the context in which they are used.