Which term is synonymous with something that is directly opposed or contrary?

The term "antithetical" is used to describe something that is in direct opposition or contrast to another concept, idea, or entity. In various contexts, including philosophy, literature, and everyday conversation, something described as antithetical is fundamentally different or opposed to something else, creating a clear distinction.

For example, good and evil are often seen as antithetical concepts, representing opposing moral values. This fundamental opposition is what makes "antithetical" the appropriate choice in this scenario, as it directly conveys the idea of being contrary to something else.

On the other hand, the other terms do not align with this meaning. "Ascribe" refers to attributing something to a cause or source, "aspersion" involves damaging remarks or criticism, and "augury" relates to omens or signs predicting the future. None of these terms convey the notion of opposition or contrast as effectively as "antithetical," solidifying its position as the correct answer.