The last link is more for constructing a language used by an alien species, rather than constructing a futuristic human language. If creating an entire language is too daunting a task, one could just invent a few slang words to scatter around for verisimilitude. An extreme case of this was in linguist Anthony Burgess's A Clockwork Orange , which required the reader to refer to the glossary every sentence or so to translate the Russian-influenced argot called " Nadsat ".