Antonyms of professional :
Examples of usage:
" On professional business, my dear Martin; strictly on professional business; and I promised my girls long ago that they should accompany me. "The World's Greatest Books, Vol III", Arthur Mee and J.A. Hammerton, Eds..
This was my last public appearance as a professional actor. "The Chronicles of a Gay Gordon", José Maria Gordon.
Suppose we leave professional secrets alone, eh? "The Man with a Shadow", George Manville Fenn.