noun
a person who has an excessive interest in or admiration of themselves
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The psychologist diagnosed him as a narcissist due to his extreme self-centeredness.
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She's such a narcissist, always talking about herself and ignoring others.
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That guy is a total narcissist, always taking selfies and posting them online.
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Being a narcissist is like looking in a mirror and only seeing yourself, never noticing others around you.