[adjective] - not showing the standard of behaviour or skills that are expected of a person in a skilled jobDoctor Rivers was charged with gross negligence, unprofessional conduct and improper use of dangerous drugs.I'd rather not be discussing one of my colleagues behind her back - it's a bit unprofessional.
UNPROFESSIONAL
Meaning of UNPROFESSIONAL in English
Cambridge English vocab. Кембриджский английский словарь. 2012