Romance Languages:
* Spanish: loco/a (informal), demente (formal)
* French: fou/folle (informal), dingue (slang)
* Italian: pazzo/a (informal), folle (formal)
* Portuguese: louco/a (informal), insano/a (formal)
* Romanian: nebun/nebună
Germanic Languages:
* German: verrückt
* Dutch: gek
* Swedish: galen
* Danish: skør
* Norwegian: gal
Slavic Languages:
* Russian: сумасшедший (sumashedshiy)
* Polish: szalony
* Czech: šílený
* Ukrainian: божевільний (bozhevіl'niy)
Other Languages:
* Japanese: 狂っている (kuruitte iru)
* Chinese (Mandarin): 瘋狂 (fēngkuáng)
* Korean: 미친 (michin)
* Arabic: مجنون (majnun)
* Hindi: पागल (pagal)
Note: These are just a few examples, and there can be many different ways to express the concept of "crazy" depending on the context and the specific nuance you want to convey.