To express something clearly and effectively can be described as what?

To express something clearly and effectively is accurately described as "articulate." This term refers to the ability to convey ideas, thoughts, or feelings in a coherent and persuasive manner. An articulate individual is skilled in communication and often presents information or arguments in a way that is easily understood by others.

In this context, "articulate" emphasizes clarity and effectiveness in expression, making it the most fitting choice. On the other hand, "advocate" refers to supporting or arguing for a cause or proposal, which does not specifically relate to the style of expression. "Aver" means to assert or affirm something confidently, which again does not capture the complete essence of clear expression. "Temper" implies moderation or restraint, which does not pertain to the act of expressing ideas clearly. Thus, the choice of "articulate" is both precise and fitting for conveying clear and effective communication.