Self-centredness is a personality trait that involves an excessive focus on oneself and one's own interests. It is often characterized by selfishness, arrogance, and a lack of consideration for others. Two words that are commonly used to describe this trait are EGOTISM and EGOISM. EGOTISM is defined as an exaggerated sense of self-importance, while EGOISM is defined as the belief that one's own interests should be pursued above all else.