unprofessional
adjective
uk/ˌʌnprəˈfeʃənəl/ usnot 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