Pure
Genuine
な adjective, の adjective
You're pure and that's stylish, which makes you even more pure, somehow. But your purity also makes you genuine, unlike all the people who aren't pure trying to be stylish.
じゅんすい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
純粋に金銭的な理由だけで、夫とまだ一緒にいるんです。
I’m still with my husband for purely financial reasons.