There might be emotional barriers like Anger, Embarassment etc due to which you might not be able to communicate better with the other person. Then using technical and complicated words also can be a barrier to effective communication. For this, you need to speak in easy and understood language. Difference in opinion and viewpoint between 2 people also can harm a good conversation. For this reason, it is good that both of them come to a common ground and agree to disagree while mutually respecting each others opinions. Interruptions, Distractions, lack of interest also can be barriers to communication. For this, you need to respect the Speaker and let him talk without interrupting. If someone has hearing disability or speech impairment, even that can hinder effective communication.