also: なるししすと
noun
Refers to a person who is excessively self-admiring or self-centered, similar to the English term. Often used in casual contexts.
彼は自分の話ばかりするナルシストだ。
He is a narcissist who only talks about himself.
SNSに自撮りばかり投稿するナルシストが増えている
There are more and more narcissists who post nothing but selfies on social media.