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.
这种材料极其坚硬，不易弯曲。
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2. The manager's decision was rigid and not flexible at all.
经理的决定非常严格，一点也不灵活。
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3. The new policy is very rigid and may cause some difficulties for the implementation.
新政策非常严格，可能会给实施带来一些困难。