Which term indicates a lack of variety or difference?

The term "Uniform" signifies a state of consistency or sameness, implying a lack of diversity or variation. When something is described as uniform, it means that it is consistent throughout and lacks distinctive features or differences. This word is often used in contexts such as clothing, where a uniform appearance can reflect conformity without deviation.

On the other hand, the other terms do not convey the same meaning. "Wily" refers to someone who is cunning or clever in achieving their goals, particularly through deceit. "Superficial" describes something that is shallow or lacking depth, often pertaining to understanding or examination, rather than a lack of variety. "Unseemly" pertains to behavior that is inappropriate or improper, which relates more to conduct than to the concept of uniformity. Thus, "Uniform" is the term that correctly indicates a lack of variety or difference.