sì-sì-kak-kak四四角角

very rigid

very rigid; very inflexible in following rules

figurative

English Wiktionary, “四四角角” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%9B%9B%E5%9B%9B%E8%A7%92%E8%A7%92 · confidence: Medium (Wiktionary PH)