Teaching is a noble profession in society globally which requires disciplined teachers. A teacher is an important person designed to facilitate learning. Therefore learning will not be possible until teaching takes place. And teaching is a deliberate structuring of an environment to facilitate learning in schools, colleges or universities. Teacher education is important part that all of the professionals undergo pre-practice training to acquire discipline skills. In this sense, teacher education can be conceptualized in teacher training colleges and universities but the discipline of teachers is internal ability from the heart of individual teacher. Training is conceptualized in two kinds; through either pre-service or in-service training courses, in teacher training institutions, however, content and methods may differ from one educational institution to another. The problem is that some teachers who undergo teacher training system to become professional teachers, become indiscipline in schools or colleges and in the community. It is against this background the research aims at investigating causes of indiscipline amongst teachers in teachers in secondary schools, through a diagnostic study. The research will adopt analytical method of empirical data. It is concluded that some teachers in secondary schools become undisciplined and reflects a negative image among learners and the members of the society, as a consequence teacher education lose its professionalism. If you ask students in schools whether they want to become teachers after their course, you find none, because of poor role model created by undisciplined teachers in the society. The research findings will be significant to sensitize the teachers to alleviate or solve problems of indiscipline in schools, Teachers Service Commission and add value in the educational sector in general for sustainable development.