Any employee in the unclassified service may be disciplined and penalized by the appointing authority by the loss of vacation days or be suspended, demoted or removed and terminated for incompetency, inefficiency, dishonesty, immoral conduct, insubordination, discourteous treatment of the public, neglect of duties, or violation of the rules and regulations of the appointing authority, or for acts of misfeasance, malfeasance or nonfeasance.