Rigid means inflexible or very strict.

硬性指不灵活或非常严格。

youdao

You don't necessarily have to have a strict, rigid military code of conduct.

你没有必要拥有一个严格、死板的、军事化的行为规范。

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Those who had handled the wood block ratedthe employee as being more rigid and strict than those who had handled the blanket.

相对于触摸过毛毯的被试，那些操作过木块的人认为雇员更加死板和严谨。

youdao

You had to wear this very strange uniform and obey all the rules, and although they fed the children well and gave them a good education, they were so rigid and so strict!

BBC: Last Updated: Thursday October 08 2009 15:19 GMT

It is hard to find a piece of free verse that outshines a well-executed traditional Shakespearian sonnet, despite the later conforming to a rigid structure of 14 iambic pentameter lines and a strict rhyme scheme.

FORBES: Design Within Limits: The Urban Agriculture Project