Final answer:
The term 'nonprogrammed' best describes decisions that are novel and unstructured, requiring managerial judgement due to their unique and complex nature.
Step-by-step explanation:
The term that best describes decisions that are novel, unstructured, and generally based on criteria that are not well-defined is nonprogrammed decisions. Unlike programmed decisions, which are routine and follow a well-defined process, nonprogrammed decisions involve unique and complex issues that require careful consideration and creative problem-solving. These decisions are typically encountered in situations where the outcomes are uncertain, and managers must use their judgment, experience, and insights to find the best course of action.