"严格"用英语可以表示为"strict"。
来源：Strict 来自拉丁语strictus，意为“紧的”或“紧绷的”。
例句：
My parents have always been strict about bedtime. (我父母一直对睡觉时间很严格。)
The teacher enforced strict discippne in the classroom. (老师在教室里执行严格的纪律。)
The company has strict rules about dress code. (公司有严格的着装规定。)