The Collaborative International Dictionary
Nonprofessional \Non`pro*fes"sion*al\, a.
Not belonging to a profession.
Not done by, or proceeding from, professional men; contrary to professional usage; unprofessional.
Wiktionary
a. not professional; amateur alt. not professional; amateur n. One who is not a professional; an amateur.
WordNet
adj. not professional; not engaged in a profession or engaging in as a profession or for gain; "the nonprofessional wives of his male colleagues"; "nonprofessional actors" [ant: professional]
Usage examples of "nonprofessional".
But the President and I and you, now, know that she was not, thanks to her private journalwhich affectation is, in itself, indicative of her hidden, weak, romantic, nonscientific, nonprofessional, very un-military side.
Norman Schwarzkopf believed the offenders were local and nonprofessional.
Personal uses of writing by nonprofessionals came only much later, as writing systems grew simpler and more expressive.
The best of Magic that is still unknown to nonprofessionals is liable to mischance and destruction.