unprofessional

[uhn-pruh-fesh-uh-nl]
adjective
1.
not professional; not pertaining to or characteristic of a profession.
2.
at variance with or contrary to professional standards or ethics; not befitting members of a profession, as language, behavior, or conduct.
3.
not belonging to a profession; nonprofessional.
4.
not done with professional competence, as a play staged or an opera performed by amateurs; amateurish.
5.
Sports. nonprofessional ( def 2 ).
noun
6.
a person who is not a professional; amateur.

Origin:
1800–10; un-1 + professional

unprofessionalism, noun
unprofessionally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unprofessional (ˌʌnprəˈfɛʃənəl)
 
adj
1.  contrary to the accepted code of conduct of a profession
2.  amateur
3.  not belonging to or having the required qualifications for a profession
 
unpro'fessionally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

unprofessional
1806, from un- (1) "not" + professional.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unprofessional, unethical or improper behavior is unacceptable.
The investigation may certainly have been unprofessional, and deserves the
  scrutiny it will no doubt receive.
The sport was unprofessional, the circuits and the cars were dangerous, and
  drivers were often killed.
Perhaps they had a bad experience with an unprofessional clown at a birthday
  party.
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