jeremiad
A long speech or prose work that bitterly laments the state of society and its morals, and often contains a prophecy of its coming downfall.
Near-synonyms: diatribe, tirade, lamentation, lament, litany; see also Thesaurus:diatribe
Where it comes from
From French jérémiade, from Jérémie, from Latin Ieremias, from Hebrew ירמיה (yirm'yá, “Jeremiah”). Named after biblical prophet Jeremiah, who lamented the moral state of Judah and predicted her downfall.
Adapted from the Wiktionary entry jeremiad (CC BY-SA 4.0).