What characteristics would you say are true earmarks of an employee who is unprofessional in his or her approach to work?

Following characteristics are the hallmarks of an unprofessional employee in general:

Late Arrival : Frequently arriving late for work is the greatest sign of unprofessional and non punctuality. Violent behavior: Display of anger and engaging into any sort of violence is highly unprofessional. Uncooperative : Being inflexible and uncooperative to terms and official protocols. Talking loudly: A loud tone conveys both rudeness and impoliteness. Bullying: Mocking other colleagues or intimidating them is regarded as unprofessional behavior. Harassment : Engaging into harassment activities such as sexual harassment constitutes unprofessional behavior.