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, making it difficult to bend.
这种材料极其坚硬，难以弯曲。
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2. The teacher's strictness made the students feel rigid and uncomfortable.
老师的严格让学生们感到僵硬和不舒服。
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3. The new policy is very rigid, requiring everyone to follow it strictly.
新政策非常严格，要求每个人都严格遵守。