diatribe

In modern times, a diatribe is not something most of us want to endure:

Our manager privately subjected a few of us to a lengthy diatribe about how terrible the company's new policy is.

I'd prefer a reasoned argument to the diatribes that typically litter the newspaper's editorial page.

That wasn't true in the word's early days, though.

When English speakers adopted diatribe in the late 16th century, they were glancing back at the ancients. The word comes from Greek diatribē, meaning "pastime" or "discourse," by way of Latin diatriba. The English word first referred to the popular lectures of ancient Greek and Roman philosophers, the usual topic of which was ethics.

When the word diatribe referred to written work in this context, that work was understood to be either a transcription of such a lecture, or a written development of one. According to some, these oral and written diatribes were the model on which modern sermons were built.

Over time, this very specific meaning of diatribe developed a more general meaning that didn't require the ancients themselves: any prolonged discourse—written or oral—could be considered a diatribe. That sense of the word, however, is now archaic; you don't typically find it in modern contexts.

When diatribe is used today, the connotation is quite different. The word most often refers to a bitter or abusive speech or piece of writing, as in the examples given above.