discursive

The Latin verb discurrere meant "to run about", and from this word we get our word discursive, which often means rambling about over a wide range of topics. A discursive writing style generally isn't encouraged by writing teachers. But some of the great 19th-century writers, such as Charles Lamb and Thomas de Quincey, show that the discursive essay, especially when gracefully written and somewhat personal in tone, can be a pleasure to read. And the man often called the inventor of the essay, the great Michel de Montaigne, might touch on dozens of different topics in the course of a long discursive essay.