HSK 7–9 · verb · adjective
疯
to go mad; crazy; insane
他工作起来像疯了一样。
Tā gōngzuò qǐlái xiàng fēngle yíyàng。
When he works, he's like a madman.
促销时大家疯狂买东西。
Cùxiāo shí dàjiā fēngkuáng mǎi dōngxi.
During the sale everyone went crazy buying things.
别理他，大家都说他是个疯子。
Bié lǐ tā， dàjiā dōu shuō tā shì gè fēngzi。
Don't mind him; everyone says he's a madman.