Vanity; excessive concern for appearance or reputation, valuing outward show over substance.
彼女は虚栄心が強く、ブランド品にお金を使いがちだ。
She has a strong vanity and tends to spend money on brand-name goods.
虚栄のために嘘をつくこともある。
Sometimes people lie out of vanity.
そんな虚栄に惑わされてはいけない。
Don't be fooled by such vanity.