Romance Languages:
* Spanish: rápido (masculine), rápida (feminine)
* French: rapide
* Italian: veloce
* Portuguese: rápido (masculine), rápida (feminine)
* Romanian: rapid
Germanic Languages:
* German: schnell
* Dutch: snel
* Swedish: snabb
* Norwegian: rask
* Danish: hurtig
* English: fast
Slavic Languages:
* Russian: быстро (bystro)
* Polish: szybko
* Czech: rychle
* Slovak: rýchlo
* Ukrainian: швидко (shvydo)
Other Languages:
* Chinese (Mandarin): 快 (kuài)
* Japanese: 速い (hayai)
* Korean: 빠르다 (ppaleuda)
* Arabic: سريع (sariʿ)
* Hindi: तेज़ (tez)
* Turkish: hızlı
* Greek: γρήγορος (grigoros)
* Finnish: nopea
* Hungarian: gyors
This is just a small selection, and there are many other languages and dialects out there. Remember that the specific word for "fast" may vary depending on the context and the specific language.