adjective (a)

• not professional; not engaged in a profession or engaging in as a profession or for gain(adj.all)

  Example:
  The nonprofessional wives of his male colleagues.
  Nonprofessional actors.
  

  Antonym:
  professional
  

  source: wordnet30
• Not belonging to a profession; not done by, or proceeding from, professional men; contrary to professional usage.(adjective)

  source: webster1913