Which word implies a desire for something one cannot possess?

The term "coveted" specifically refers to a strong desire for something that is often difficult or impossible to attain. When one covets something, it usually implies an intense longing or yearning for something that one perceives as valuable or desirable, yet may be out of reach. This word encapsulates both the emotional aspect of wanting and the recognition that what is desired is not readily available.

In contrast, the other choices do not convey this particular sense of longing for something unattainable. For instance, "cowered" relates to showing fear or submission, "cordial" signifies warmth and friendliness in disposition, and "curtail" means to reduce or limit something. None of these words capture the essence of desiring something that one cannot have, which is why "coveted" is the most fitting choice in this context.