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English definition of “unprofessional”

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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 from the Cambridge Business English Dictionary © Cambridge University Press)
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