毫无根据的恐惧

groundlessness───无根

groundless───adj.无理由的

groundlessly───adv.毫无根据地

boundlessness───n.无穷

ground beam───[建]地梁

ground cedar───欧洲刺柏

ground effect───地面效应

This fear was not groundless for he himself had really seen it happen to other moulting crabs.───要被别的螃蟹吃去的，这并非空害怕，他实在亲眼见过。

Maybe it is just an unwarranted anxiety or groundless fear.───也许，这只是杞人忧天或者无根据的恐惧。

Thus the idiom "Like the man from Qi who feared that the sky might fall" means to hold a needless or groundless fear or worry.───后来人们根据这个故事引申出“杞人忧天”这句成语，现在用来比喻不必要或无根据的忧虑和担心。