 The language spoken by Alex and his droogs is author  Anthony Burgess (qv)s invention, "Nadsat": a mix of English,  Russian and slang. Stanley Kubrick (qv) was afraid that they had  used too much of it, and that the movie would not be accessible. The  original edition of the novel suffered from similar criticisms, and  a Nadsat glossary appendix was added to the second and subsequent  editions.