This is the 3877th most frequent Korean word.
엄격한
Strict.
Here, '엄격한' describes the attribute of the school's rules, signifying their strictness.
우리 학교의 규칙은 매우 엄격합니다.
Our school rules are very strict.
In this sentence, '엄격한' is used in an adverbial manner ('엄격하게') to describe the way he acts.
그는 자신의 규칙에 대해 엄격하게 행동한다.
He acts strictly according to his rules.
Here, '엄격한' is describing her stance or approach to her children's education.