Abligurition: Spending lavish amounts of money on food and drink
Beef-witted: Slow-witted or dull
Cacafuego: A braggart or blusterer
Cacoethes: The irresistible urge to do something inadvisable
Callipygian: Having beautiful, well-shaped buttocks
Cockalorum: A small, boastful person
Defenestration: The act of throwing someone out of a window
Dysania: The extreme difficulty one experiences when getting out of bed in the morning
Elf-locks: Tangled or matted hair, supposedly caused by elves
Feague: To put a live eel up a horse’s bum to make it seem more lively
Frobly-mobly: Neither well nor unwell, the 18th-century equivalent of "meh"
Fudgel: Pretending to work while doing nothing
Gongoozle: To stare idly at a canal or watercourse
Groak or Groke: To stare at someone eating in the hope they’ll share
Grumbletonians: People who are angry or unhappy with the government
Hugger-mugger: Secretive or disorderly behaviour
Jargogle: To confuse or jumble up
Kakistocracy: Government by the least qualified or worst people [Ed: MAGA 2025]
Kench: To laugh in a way that is spontaneous and loud
Lanspresado: Someone who always conveniently shows up with no money
Lunting: Walking while smoking a pipe
Momist: A person who finds fault in everything
Nibling: A 19th-century term for a niece or nephew
Opsimath: A person who begins learning late in life
Perendinate: To put off until the day after tomorrow
Philogrobilized: Having a hangover but without admitting to actually drinking
Peg puff: A young woman with the manners of an old one
Quacksalver: A fraudulent doctor or seller of fake medicine
Razzle: To cook something until the outside of it burns, while the inside remains raw
Sanguinolent: Addicted to bloodshed
Scurryfunge: A hasty tidy-up when guests arrive unexpectedly
Shivviness: The uncomfortable feeling of wearing new underwear
Snollygoster: A person who has intelligence but no principles, especially a politician
Snudge: To stride around as though you’re terribly busy, when in fact you are doing nothing
Tarantism: An uncontrollable urge to dance
Twattling: Gossiping idly about unimportant things
Uhtceare: Lying awake before dawn, worrying
Ultracrepidarian: Somebody who gives opinions about topics they know nothing about
Wamblecropt: To be overcome with indigestion
Yex: To hiccup or sob spasmodically
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References

theguardian.com/books/booksblog/2013/oct/09/mark-forsyth-the-horologicon-top-10-lost-words
bbc.co.uk/programmes/articles/4clpqZdD04mMgsL52xh2lXZ/seven-old-english-words-that-deserve-to-make-a-comeback
historyhustle.com/20-awesome-historical-words-we-need-to-bring-back/
matadornetwork.com/abroad/20-obsolete-english-words-that-should-make-a-comeback/

Images

1. Lanspresado
2. Matthäus Merian's impression of the 1618 Defenestration of Prague
3. Elf-locks. Credit: Pinterest
4. Feaguing a horse can make it appear more lively.
5. Goongozzling T-shirt. Credit: Wiggles Dailey on Red Bubble
6. International Lunting Society on Facebook