From Longman Dictionary of Contemporary English(stark) raving mad/bonkers(stark) raving mad/bonkersinformal completely crazy → ravingstark raving mad/bonkersstark raving mad/bonkers (also stark staring mad British English)CRAZY completely crazy He’s gone stark raving mad. → stark
Examples from the Corpus
stark raving mad/bonkers• All of this doesn't mean he wasn't stark raving mad, and just putting on. 