1、It was an inconceivably stupid thing to have done.
豈有此理，他竟干出了如此蠢事！

2、It would have been inconceivably dangerous even if he had known how to set about doing it.
這種事，哪怕他知道如何著手，也危險(xiǎn)得不可思議。

3、inconceivably extended in space or time.
在時間或空間上無限延伸的。

4、It is still inconceivably first-rate fun on spruced slopes.
它仍然令人不可置信，一流的山坡上聳立的樂趣。

5、The task prove inconceivably more difficult than we have imagine.
任務(wù)的困難程度超過我們的想像，確實(shí)難以置信。