吓得一愣

be dumbstruck with fright

愣了一会儿

be dumbstruck for a while

愣在一旁

stupefied

他愣了半天没说话。

He was dumbfounded and didn't speak for a long time.

老妈妈愣住了

the old woman was dumbfounded

孩子们听了这凄惨的往事，都愣住了。

The children were struck dumb at hearing of this tragic event.

愣小子

reckless boy

他愣极了，什么事都敢做。

He is very rash and isn't scared to do anything.

愣来

go so far as to come

明知不对，他愣那么说。

He knew perfectly well it was wrong, but he still said it.