egomania

From ego +‎ -mania.

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• Rhymes: -eɪniə

egomania (usually uncountable, plural egomanias)

1. Excessive vanity, pride or arrogance; self-importance.

   There's a lot of egomania going around: it seems everyone believes they are the most capable and important person in the room.

• egomaniac
• egomaniacal
• egomaniacally