relating to a hope or dream that is extremely unlikely ever to come true

His self-image as a writer seems chimerical. 他作为作家的自我形象似乎是臆想出来的。

As if the real world weren't scary enough, chimerical threats are everywhere. 好像现实世界还不够可怕似的，妄想虚构的威胁也无处不在。