Correct

发傻

/ fà shǎ / 
Strokes

Example

As a Verb

be dumbfounded; be in a daze

1
Tīngdào
听到
zhège
这个
xiāoxi
消息
  
,
tā
他
yī
一
xiàzi
下子
fàshǎ
发傻
le
了
  
。

He was dazed at the news.

As a Verb

act foolishly