形容词
中文翻译：坚硬的
同义词：
['stiff', 'unyielding', 'inflexible']
例句：
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1. The metal is extremely rigid and cannot be bent easily.
这金属极其坚硬，不易弯曲。
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2. The scientist's theory is too rigid to be accepted by the public.
科学家的理论过于僵硬，无法被公众接受。
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3. The new product has a rigid design that makes it difficult for consumers to modify.
新产品设计过于僵硬，消费者难以修改。