Egoistical a. : Pertaining to egoism; imbued with egoism or excessive thoughts of self; self-loving.

Example:
What can happen if you hurt an Egoistical/selfish person's ego?

Taxonomy
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Defination from the web:
egoistical in the Online Dictionary. Meaning of egoistical. Pronunciation of egoistical. Translations of egoistical. egoistical synonyms, egoistical antonyms. ... own affairs as inviolable as it had often been convenient for rather an egoistical young man to think it? ...