What are the three partsthat the contract must have? Do you think a contract has to be written only or can it be verbal as well? A good way to understand what will make a voidable contract is a formal agreement between two parties that may be rendered unenforceable for a number of legal reasons. Reasons that can make a contract voidable include the following: Failure by one or both parties to disclose a material fact. A mistake, misrepresentation or fraud. Undue influence or duress. What do you think the conditions or for a minor to enter a contract with someone?