Romance Languages:
* Spanish: Tranquilidad
* French: Tranquillité
* Italian: Tranquillità
* Portuguese: Tranquilidade
* Romanian: Liniste
Germanic Languages:
* German: Ruhe
* Dutch: Rust
* Swedish: Lugn
* Danish: Ro
* Norwegian: Ro
Slavic Languages:
* Russian: Спокойствие (Spokoystvie)
* Polish: Spokój
* Czech: Klid
* Ukrainian: Спокій (Spokiy)
* Bulgarian: Спокойствие (Spokoystvie)
Other Languages:
* Japanese: 平穏 (Hei-on)
* Chinese (Mandarin): 平静 (Píngjìng)
* Korean: 고요함 (Goyoh-am)
* Arabic: هدوء (Hudū')
* Hindi: शांति (Shaanti)
Note: Some languages have multiple words that can be translated as "tranquility" depending on the specific nuance you are trying to convey.
For example, in English, "tranquility" can refer to both a state of peace and a lack of activity. Other languages may have separate words for these two concepts.