diatribe

Etymology

First attested 1581, borrowed from French diatribe, from Latin diatriba (“learned discussion or discourse”), from Ancient Greek διατριβή (diatribḗ, “way of spending time, lecture”), from διά (diá, “through”) + τρίβω (tríbō, “I waste, wear out”)

noun

1. An abusive, bitter verbal or written attack, criticism or denunciation.
   The senator was prone to diatribes which could go on for more than an hour.
   … No rogue e’er felt the halter draw, with a good opinion of the law, and perhaps my own detestation of the law arises from my having frequently broken it. If this long diatribe bores you, just say so, and I’ll cut it short. 1913, Robert Barr, chapter 4, in Lord Stranleigh Abroad
   You know, it’s all this racial diatribe, and very strong language, screaming at the top of his lungs into the telephone. 1991, Bill Crow, Jazz Anecdotes, Oxford University Press, page 316
   Aunt Petunia wasn’t eating anything at all. Her arms were folded, her lips were pursed, and she seemed to be chewing her tongue, as though biting back the furious diatribe she longed to throw at Harry. 2000, J. K. Rowling, Harry Potter and the Goblet of Fire, Scholastic Press, page 41
   Lest this [be] read as a diatribe against DfT, I have some sympathy with it. That's because whenever there's a problem with the railway, the industry's solution is to ask DfT for billions of pounds. May 5 2021, Philip Haigh, “I think we need better than this from the rail industry”, in RAIL, number 930, page 51
2. A prolonged discourse; a long-winded speech.