One of the older notes on my idea board is a tiny Post-It™ with just a single word written on it: recrudescence. Wiktionary defines it as: “The condition or state being recrudescent; the condition of something (often undesirable) breaking out again, or re-emerging after temporary abatement or suppression.”
It is primarily a medical term referring to a disease reoccurring; the second Wiktionary definition is: “The acute recurrence of a disease, or its symptoms, after a period of improvement.”
But when I encountered the word several years ago, it struck me as a very good word for this “post-factual” era: the Dark Ages rises again.