IPA: //ˌiːɡəʊˈtɪstɪk//
KK: /ɪˈɡoʊtɪstɪk/
Having an excessive sense of self-importance or self-centeredness; focusing mainly on oneself and one's own interests.
His egotistic behavior made it difficult for others to work with him.
Egotistic → It is formed from "ego" (from Latin, meaning I or self) and "-istic" (a suffix used to form adjectives indicating a characteristic). The word "egotistic" describes a characteristic of being excessively self-centered or self-absorbed.
Think of 'ego' meaning 'self' — this helps you remember that 'egotistic' refers to someone who is very focused on themselves.