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be a (strict) disciplinarian
disciplinarian 是可数名词，常与 strict 连用，表示‘严格执行纪律的人’。
He is a strict disciplinarian and never overlooks mistakes.
他是个严格的纪律执行者，从不放过错误。
执行纪律者；厉行纪律的人
disciplinarians — plural of disciplinarian
先理解核心含义，再看它在真实句子里的用法。
执行纪律者；厉行纪律的人
a person who demands strict conformity to rules and forms
He is a strict disciplinarian and never overlooks mistakes.
他是个严格的纪律执行者，从不放过错误。
严格执行纪律者；训导者。
One who exercises discipline.
信奉纪律作为管控手段的人。
One who believes in discipline as a tool for regulation or control.
Our new coach is a strict disciplinarian who expects every player to arrive ten minutes early.
我们的新教练是个严格的纪律执行者，要求每位队员提前十分钟到达。
As a disciplinarian, the teacher never let students hand in homework late.
作为一位纪律执行者，这位老师从不让学生迟交作业。
The principal was known as a fair but firm disciplinarian.
这位校长以公正而严格的纪律执行者著称。
disciplinarian 是可数名词，常与 strict 连用，表示‘严格执行纪律的人’。
He is a strict disciplinarian and never overlooks mistakes.
他是个严格的纪律执行者，从不放过错误。
The manager acts as a disciplinarian when staff break the rules.
当员工违反规定时，经理会充当纪律执行者。
regard...as... 意为‘认为……是……’，as 后接名词。
The children regard their grandfather as a disciplinarian.
孩子们把祖父视为纪律执行者。
Not this
My history teacher is strict disciplinarian.
Use this
My history teacher is a strict disciplinarian.
disciplinarian 是单数可数名词，指人，在英语中前面必须有限定词（如 a/an），而汉语没有冠词，所以容易漏掉。加上 a 后句子才完整。
Not this
The new coach is a real discipline.
Use this
The new coach is a real disciplinarian.
discipline 是抽象名词（纪律/训练），不能指人；指执行纪律的人要用 disciplinarian。把 discipline 换成 disciplinarian 才能表达“纪律执行者”的意思。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
严格的纪律执行者
The coach was a strict disciplinarian who never let players miss practice.
这位教练是个严格的纪律执行者，从不让球员缺席训练。
坚定的纪律执行者
As a firm disciplinarian, she expected her students to follow every rule.
作为坚定的纪律执行者，她要求学生遵守每一条规则。
严厉的纪律执行者
The old headmaster was known as a harsh disciplinarian.
老校长以严厉的纪律执行者著称。
严父（执行纪律的父亲）
His disciplinarian father made him study two hours every night.
他那位执行纪律的父亲让他每晚学习两个小时。
扮演纪律执行者的角色
I don't like to play the disciplinarian, but someone has to enforce the rules.
我不喜欢扮演纪律执行者的角色，但总得有人执行规矩。
Use disciplinarians naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：discipline（纪律）+arian（人），眼前出现戴红袖章的纪律委员，专抓不守规矩者——执行纪律的人。
语域：mixed 常见场景：school、family、military 该词通常用于正式或书面场合，指严格要求他人遵守纪律的人；在日常口语中较少见，更常说 strict teacher/parent 等。整体语气中性偏正式，需根据语境选择。
这些词都以 /ˈ(t)ɛəriən/（美式常读作 /ˈ(t)ɛriən/）结尾，与 disciplinarian 押韵。注意 disciplinary（纪律的）拼写相近，但重音在 /ˈdɪsəplɪnəri/，不与 -arian 押韵。
Dictionary facts from ECDICT, WIKTIONARY.