Facile means easy, superficial, or lacking depth. It describes something that appears simple but may overlook complexity or difficulty. Among the options, 'Easy' (Option D) is the correct synonym. 'Complex' and 'Perplexing' are antonyms. 'Wandering' is unrelated. 'Enjoy' is a verb while facile is an adjective. In academic contexts, facile arguments are those that oversimplify issues.