1

For example, if you say you’ll be there at 10, you better show up at exactly 10, not 10:04. My son is like this. If we make a rule, we cannot change it without a fight.

2
  • I'll go with adamant: refusing to be persuaded or to change one's mind.
    – Ubi hatt
    Sep 8 at 11:26
  • The duplicate target doesn't seem right. A person who takes something literally, (e.g. upon hearing "throw the baby out with the bathwater", expects there to be a baby involved), is not the same thing as someone who understands what is being said, and wants to adhere to that strictly.
    – cigien
    Sep 8 at 13:20
4

I would describe such a person as fastidious

giving too much attention to small details and wanting everything to be correct and perfect

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  • or maybe 'inflexible'
    – Mitch
    Sep 7 at 22:48
  • @Mitch Yeah, that would work as well.
    – cigien
    Sep 7 at 23:10
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unyielding

(of a person or their behavior) unlikely to be swayed; resolute. Lexico

You describe someone as unyielding when they have very strong, fixed ideas about something and are unlikely to change their mind. Collins


Miss Kuhlman said that initially waiting for their turn was rather chaotic, but after the first couple of weeks, they understood that waiting politely for their turn was the only way they would be able to ride the tricycle. Miss Kuhlman was unyielding about her rules. B. E. Lithander; Life's Pages—A Story Worth Sharing (2010)

He thought as a judge down to the time when he had made up his mind, and after that his obstinacy was unyielding. The American Law Review, Vol. 25 p.25 (1891)

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