4 sentences

1. 她有点疯疯癫癫的。

   tā yǒu​diǎn fēng​feng​diān​diān de.

   She's a little crazy.

   Source: OpenSubtitles

2. 他受了惊吓以后，变得有些疯疯癫癫的。

   tā shòu le jīng​xià yǐ​hòu, biàn de yǒu​xiē fēng​feng​diān​diān de.

   After being frightened, he became a bit erratic.

   Source: Dong Chinese Dictionary

3. 自从遭受重大打击后，他就变得疯疯癫癫的。

   zì​cóng zāo​shòu zhòng​dà dǎ​jī hòu, tā jiù biàn de fēng​feng​diān​diān de.

   Ever since he suffered a major blow, he has become mentally unstable.

   Source: Dong Chinese Dictionary

4. 那个孩子整天疯疯癫癫地跑来跑去，没个正经。

   nà​gè hái​zi zhěng​tiān fēng​feng​diān​diān de pǎo​lái​pǎo​qù, méi gè zhèng​jīng.

   That child runs around wildly all day, never being serious.

   Source: Dong Chinese Dictionary