soon: [OE] In Old English times, soon meant ‘straightaway’, but human nature being what it is, the tendency to procrastinate led over the centuries to a change in meaning to ‘after a short while’. (The same thing happened to anon, and is in the process of happening to directly.) The word itself comes from a prehistoric West Germanic *sǣnō, whose other descendants apart from soon have all but died out. [soon etymology, soon origin, 英语词源]