C1 not showing the standard of behaviour or skill that is expected of a person in a skilled job不职业的;业余的;违反职业行为准则的
More examples
She was doing her best to help, but her manner was a bit unprofessional.
I know she felt annoyed, but that angry outburst was totally unprofessional.
It's a bit unprofessional to talk about other members of staff like that.
I hope she didn't think I was being unprofessional.
It's very unprofessional to let your private life spill over into your working life.
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