hardness

例句：

1. A stone once believed to be impenetrable in its hardness.
   硬石，金剛石一種曾被認為在硬度上不可穿透的石頭
2. Despite the hardness of his bed, he is soon sleeping soundly.
   雖然床很硬，他還是很快地睡熟了。
3. I can't open the door with hardness of stone.
   我不能打開那扇石門。
4. Their hardness was understood by the teacher.
   他們的艱難得到老師的理解。

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英文解釋：

名詞 hardness:

1. the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
2. devoid of passion or feeling; hardheartedness
   同義詞：unfeelingness, callousness, callosity, insensibility
3. the quality of being difficult to do
   同義詞：ruggedness
4. excessive sternness
   同義詞：severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, stiffness

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