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 difficult to bend.
这种材料非常坚硬且难以弯曲。
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2. The law is rigid and cannot be easily changed.
法律是严格的，不能轻易改变。
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3. The structure of the building is rigid, making it difficult to modify.
建筑物的结构非常坚固，难以修改。