unreality

n.不真实；虚幻

I had a deep felling of unreality. 我深有一种不真实的感觉。

History books often seem to be invested with an air of unreality. 史书似乎常被赋予几分不真实的色 彩。

Despite the crisis, a sense of unreality prevails. 尽管危机确已存在，但是很多人眼里却有一种虚幻感。