形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The metal is very rigid and cannot be bent easily.
这金属非常坚硬，不容易弯曲。
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2. The teacher's instructions were very rigid and required strict adherence to them.
老师的指令非常严格，需要严格遵守。
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3. The new policy is quite rigid and may cause some confusion among employees.
新政策相当严格，可能会给员工带来一些困惑。