§ 1345-1.4.13.1. Fraud in securing appointment, incompetency, inefficiency, inexcusable neglect of duty, physical or mental disability, insubordination, dishonesty, drunkenness on duty, intemperance, addiction to the use of narcotics or habit-forming drugs, inexcusable absence without leave, conviction of a felony or misdemeanor involving moral turpitude, immorality, discourteous treatment of the public or other employees, improper political activity in violation of Sections 1351 and 1351-1 of this Code, willful disobedience, violation of any provision of this Article, any other failure of good behavior or any other act which is incompatible with or inimical to the public service.