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 very rigid and cannot be bent easily.
这种材料非常坚硬，不易弯曲。
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2. The laws are quite rigid and it's difficult to change them.
法律相当严格，很难改变。
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3. The new policy is rigid and may not be easily adapted to the needs of the people.
新政策非常严格，可能不容易适应人民的需求。