偶尔使用。在柯林斯辞典中， senile 是3万个最常用词之一。
英式英语: senile ADJECTIVE
If old people become senile, they become confused, can no longer remember things, and are unable to look after themselves.
The old man was showing unmistakable signs of senility.
senile 的定义—— 柯林斯 英语词典
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