Final answer:
A contract with a person under court-ordered guardianship is voidable because the person may lack legal capacity to understand the contract.
Step-by-step explanation:
A contract with a person who is under a court ordered guardianship is voidable. This means that the contract can be canceled or annulled by the person under guardianship. The person under guardianship has the option to enforce or terminate the contract based on their own decision. The reason for voidability is that the person under guardianship may not have the legal capacity to fully understand the terms and consequences of the contract.