These could be words or phrases that are no longer relevant, or were era-culturally sensitive, or died a well-deserved vocabulary death...
For example:
Quote by ShamelessFlirt
I'm a walking cliche and frequently use words and phrases that are considered obscure or antiquated. I was describing a prior relationship once and used the word "farcical". I haven't heard the word erudite in some time. And I get upset when I sign up at places that involve writing and the ID "Raconteur" is taken.
Quote by adele
bee’s knees,” denotes that something is good, desirable or pleasing
Quote by honeydipped
i beg to differ?
Quote by Stackexchange website
The bee's knees is an English slang phrase.
The Oxford English Dictionary records the expression "bee's knee" as meaning something small or insignificant from 1797.
The phrase "the bee's knees", meaning "the height of excellence", became popular in the U.S. in the 1920s, along with "the cat's whiskers" (possibly from the use of these in radio crystal sets), "the cat's pajamas" (pajamas were still new enough to be daring), and similar phrases that didn't endure: "the eel's ankle", "the elephant's instep", "the snake's hip" and "the capybara's spats".
The phrase's actual origin has not been determined, but several theories include "b's and e's" (short for "be-alls and end-alls") and a corruption of "business" ("It's the beezness.")
Quote by honeydipped
lol OBVIOUSLY i'm being facetious?
hint: check out my forum rank.
Quote by adele
keen, or peachy keen