1. excessively self-centered; concerned chiefly with one's own interests, needs, or well-being
Usage: Often used interchangeably with 'egotistical,' though 'egoistical' emphasizes selfish behavior rooted in philosophical egoism

Examples

• His egoistical attitude made it difficult for him to work well with teammates.
• She was criticized for her egoistical behavior at the meeting, constantly interrupting others.
• The egoistical politician only cared about personal gain, not public welfare.
• His egoistical worldview prevented him from understanding other people's perspectives.
• The egoistical character in the novel refused to help anyone but himself.
• Her egoistical comments about her achievements annoyed everyone in the room.