This article has penetrated the constraints derived from beliefs of teachers, and how they drive Communicative Language Teaching (CLT) not to be implemented properly in Bangladesh. Numerous studies conducted earlier investigated and revealed the issues affecting the successful implementation of CLT. This article exclusively investigates on the beliefs held by teachers and sources of those beliefs with its wider exploration. Examining such phenomenon in other EFL contexts, this study intends to find out the similarities of problem in terms of belief and sort out strategies adapted there to reshape beliefs of the teachers. Besides, this article also uncovers the problematic sources of EFL teachers' belief. The qualitative method is followed to complete the investigation. It is found that most of the teachers are cognizant about what CLT supposes them to do. Due to some barriers generated from the setting and their reluctance, CLT is not implemented properly. Therefore, contradictory stance of the teachers drastically affects the classroom practice following CLT. Finally, it is revealed that beliefs generated from teachers' own experience as language learners, experience of what works best and principles derived from an approach or method persuade teachers to perceive CLT with a bunch of wrong connotations.