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English definition of “unprofessional”

unprofessional

adjective     /ˌʌnprəˈfeʃənəl/
not showing the standard of behaviour or work that is expected of a person doing their job : unprofessional behaviour/conduct Two employees have been suspended after allegations of unprofessional behaviour . The tribunal upheld her complaint that he had treated her in an unprofessional manner . → Compare non-professional, professional adjective
(Definition of unprofessional adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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