Final answer:
The lack of closets and bathrooms in the large house is considered functional obsolescence, which can negatively impact its value.
Step-by-step explanation:
The lack of closets and bathrooms in the large house that is being appraised is best defined as functional obsolescence. Functional obsolescence refers to a feature or characteristic of a property that is no longer desirable or useful, and can negatively impact its value. In this case, the lack of sufficient bathrooms and closets in a house with four bedrooms would be considered a functional deficiency and could be a reason for the property's lower value in comparison to other houses in the area.