What term describes something that is lacking flavor?

The term that describes something that is lacking flavor is "insipid." This word specifically refers to a deficiency in tastefulness or flavor, often indicating that something is bland or dull. When used to describe food or drink, it conveys the idea that the item does not provide the stimulating or enjoyable qualities of flavor that one might expect.

In contrast, other terms like "tasty," "spicy," and "savory" denote positive qualities related to flavor. "Tasty" implies that something is enjoyable to eat, while "spicy" suggests a strong, piquant flavor typically associated with heat from spices. "Savory" refers to a rich, pleasant taste often found in umami flavors or hearty foods. Thus, "insipid" stands out as the only option that directly correlates to a total absence of flavor.