What does "subtle" refer to?

The term "subtle" pertains to something that is not immediately obvious or easily discernible. It describes nuances and details that may go unnoticed at first glance but can still have a significant impact when appreciated or understood. The context in which the word is often used involves delicacy or fine distinctions, suggesting a quiet or understated quality that requires careful observation to appreciate.

In contrast, the other choices depict qualities that stand in stark opposition to the meaning of "subtle." For instance, "clearly visible" suggests a presence that is easily recognized, while "extremely obvious" denotes something that cannot be missed. "Overly flamboyant" describes something that is loud and showy, which is also contrary to the quietness implied by "subtle." Thus, "hardly noticeable" aligns perfectly with the essence of subtlety, capturing the idea that something can exist or operate beneath the surface without drawing attention to itself.