disapproval If you use unprofessional to describe someone's behaviour at work, you are criticizing them for not behaving according to the standards that are expected of a person in their profession. What she did was very unprofessional. She left abruptly about 90 minutes into the show He was also fined $150 for unprofessional conduct. professional. behaving in a way that is not acceptable in a particular profession
not characteristic of or befitting a profession or one engaged in a profession; "described in unprofessional language so that high school students could understand it"; "was censured for unprofessional conduct"; "unprofessional repairs