When it comes to discussing an issue, the aptness of arguments is crucial. It refers to the relevance and effectiveness of the points being made. However, there are several other synonyms that can be used to describe this concept. Some of them include cogency, persuasiveness, validity, soundness, and relevance. All of these terms convey the idea that the arguments being presented are both logical and convincing. Using these synonyms can help to add variety to your writing and make your points more impactful. Regardless of the word used, it is important to strive for aptness of arguments in any discussion or debate.