Englishegotism (also egoism)
noun
in his arrogance and egotism, he underestimated Gill:
self-centredness, egocentricity, egomania, self-interest, selfishness, self-seeking, self-serving, self-regard, self-absorption, self-obsession, self-love, narcissism, self-admiration, self-adulation, vanity, conceit, conceitedness, self-conceit, pride, self-esteem, self-importance;
boastfulness, boasting, bragging, blowing one's own trumpet;
French amour propre;
informal looking after number one;
rare braggadocio.
▷antonyms altruism; modesty.