(of a situation or event)too unlikely or undesirable to be considered a possibility
(情况,事件)想不到的;不可能的;想象不到的
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it was unthinkable that John could be dead. 真想不到约翰会死了
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[as noun
the unthinkable ]the unthinkable happened — I spoke up .想不到的事发生了——我居然大胆地发表了我的看法了。