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unprofessional

[uhn-pruh-fesh-uh-nl]
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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).
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noun
  1. a person who is not a professional; amateur.
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Origin of unprofessional

First recorded in 1800–10; un-1 + professional
Related formsun·pro·fes·sion·al·ism, nounun·pro·fes·sion·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unprofessional

unprofessional

adjective
  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
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Derived Formsunprofessionally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unprofessional

adj.

1806, from un- (1) "not" + professional.

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Online Etymology Dictionary, © 2010 Douglas Harper