unthinkable [ʌn'θɪŋkəbl]

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附加级

adj. 不能想的,想像不到的,过份的

It was unthinkable that she could be dead. 她竟然去世了，真是很难相信。
It would be unthinkable to ask him to do that. 叫他做那件事是毫无可能的。