unprofessional

Từ điển Oxford Advanced Learner 8th

un·pro·fes·sion·al [unprofessional unprofessionally] BrE [ˌʌnprəˈfeʃənl] NAmE [ˌʌnprəˈfeʃənl] adjective
not reaching the standard expected in a particular profession
•She was found guilty of unprofessional conduct.
Opp: ↑professional
compare ↑non-professional
Derived Word: ↑unprofessionally