Classical
な adjective
When something is "old rules-like," it is not very modern. It is in the past. It is classical.
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.
古典的な美人
a classical beauty
古典的な冗談
a classic joke
古典的な物語
a classical tale
ずいぶん古典的なギャグだね。
That's quite a classical joke, isn't it?
こんな古典的なサギに引っかかってしまって、本当に情けないです。
It's super shameful that I was deceived by such a classical fraud.
デートアプリで出会った彼は、古典的名作に対する考え方が古典的すぎて、私とは意見が合わなかったので別れました。
I broke up with the guy I met on a dating app because his views on classic masterpieces were too old-fashioned and didn't align with mine.