Vanity
noun
When how much you prosper goes into your heart and just enters a void, it will rarely mean anything to you. A person who has this trait is going to have extreme vanity because he/she just needs to suck more and more prosperity into their bottomless pit of a heart. It's like a black hole. They need more and more and more so then they have to become vain.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
虚栄心の強い人は、男でも女でも苦手です。
I don't like vain people, regardless of their gender.
ウチの親は虚栄心のカタマリです。
My parents are the embodiments of vanity.
当時は、周りの人たちに自分の虚栄心に気づかれるんじゃないかと、いつもビクビクしていました。
At that time, I was always on edge, afraid that the people around me would notice my vanity.