el egoísmo - selfishness, self-centeredness, egoismSpanish example: Ni el completo egoísmo, ni el completo altruismo ofrecen buenos resultados al individuo.
English example: Neither total selfishness nor total selflessness provide good results to the individual.
Source: el egoísmo - selfishness, self-centeredness, egoism (https://www.123teachme.com/spanish_feeds/word_of_the_day/2021/9/20)