(1) incompetence;
(2) wilful neglect of duty;
(3) wilful violation of the rules and regulations of the State Board of Education;
(4) unprofessional conduct;
(5) drunkenness;
(6) cruelty;
(7) crime against the law of this State or the United States;
(8) immorality;
(9) any conduct involving moral turpitude;
(10) dishonesty;
(11) evident unfitness for position for which employed;
(12) sale or possession of narcotics; or
(13) breach of contract.