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Egoism
01
エゴ
the practice of placing one's own needs and desires above those of others
02
エゴ
(ethics) the theory that the pursuit of your own welfare in the basis of morality
例
Her egoism was evident when she chose the last piece of cake for herself without offering it to anyone else.
In competitive environments, egoism can sometimes be an asset, but it's detrimental in collaborative settings.
Despite his wealth, his egoism prevented him from donating to any charitable causes.