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.
古典的な物語
a classical tale
古典的な冗談
a classic joke
古典的な美人
a classical beauty
コウイチは写真で古典的なポーズをとるのが好きなようだね。
Koichi seems to like taking classical poses in photos.
こんな古典的なさぎ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.
あの日本の古典的なスタイルの画家は、私が知っている人の中で、一番好みがうるさいです。どうしてそんなに色々気にするのか理解不能です。
That classical-style Japanese painter is the pickiest person I know. I can’t understand why she cares so much.