On this day in 1897, the first copies of Bram Stoker's novel Dracula went on sale in London bookstalls.
Stoker coined the noun un-dead, which he in fact considered as a title for his story. The word had appeared before that in the Oxford English Dictionary, as an adjective.
The Official Scrabble Player's Dictionary considers undead to be a noun. It gives legitimacy to the extremely dumb word unbe, "to cease to have being." Most other dictionaries list unbe as archaic.
It also lists "unlive" as a verb, defining it as "to live so as to make amends for."
Other amusing "un-" verbs in the OSPD:
Unchoke ("to free from choking"); unchurch ("to expel from a church"); unguard ("to leave unprotected"); unmingle; unsell; unswear; and unthink.