Hereinbelow are some from Victorian and Edwardian times.
beastly (as in 'so beastly critical')
capital! (as an exclamation of delight)
very civil (of you)
pray (come in)
In my lifetime I have seen technological terms become archaic very quickly. Among the technological archaisms we have to explain to children are what a 'record' is, why they call it 'dialing' a phone, the fact that, once, you couldn't rewind TV shows....
James Poniewozik, "Wake Up and Smell the Cat Food in Your Bank Account." Time magazine, May 2, 2007
If you are a writer of non contemporary stories as I sometime am, you will want to write about your gentle ladies, knights, and heros without slipping in to Gadzookery. You would want to give the flavor of the words used in another century without being too "overwrought and intensely atmospheric." as critic Mary Cadogan once stated about Countess Orczy author of The Scarlett Pimpernel. Orczy's novels were pure melodramas. "In The Nest of the Sparrowhawk (1909), for example, a malicious guardian in Puritan Kent tricks his beautiful, wealthy, young ward into marrying him by disguising himself as an exiled French prince. He persuades his widowed sister-in-law to abet him in this plot, in which she unwittingly disgraces one of her long lost sons and finds the other murdered by the villain." Wickipedia It certainly sounds melodramatic and Bodice Ripping.