形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The material is extremely rigid and cannot be bent easily.
这种材料非常坚硬，不容易弯曲。
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2. She has a rigid work ethic that she won't compromise on.
她有着坚定的工作态度，不会妥协。
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3. The new policy is designed to be rigid but fair.
新政策旨在公平但严格。