un·pro·fes·sion·al

[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.
00:10
Unprofessional is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

Origin:
1800–10; un-1 + professional

un·pro·fes·sion·al·ism, noun
un·pro·fes·sion·al·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unprofessional (ˌʌnprəˈfɛʃənəl) [Click for IPA pronunciation guide]
 
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.
Such unprofessional relationships raise questions of favoritism and lack of
  equal opportunity for education.
Only despotic leaders and unprofessional hacks should have something to hide
  from those they supposedly serve.
The investigation may certainly have been unprofessional, and deserves the
  scrutiny it will no doubt receive.
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