How to Say "self-importance" in Spanish
The Spanish word for “self-importance” is “ego” — B2 level. This is a very common word in everyday Spanish.

Examples
Tiene un ego muy grande y no acepta críticas.
He has a very large ego and doesn't accept criticism.
El psicólogo habló sobre la necesidad de equilibrar el ego y el altruismo.
The psychologist spoke about the need to balance the ego and altruism.
Su ego se sintió herido cuando perdió el partido.
His self-importance felt hurt when he lost the game.
Masculine Noun Rule
Even though 'ego' ends in 'o', which usually indicates a masculine noun, remember that it almost always uses the masculine article 'el' (el ego).
Misusing the Article
Mistake: “La ego de mi jefe es enorme.”
Correction: El ego de mi jefe es enorme. (Use the masculine article 'el'.)
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