Romance Languages:
* Spanish: agradecimiento (masculine noun)
* Italian: gratitudine (feminine noun)
* French: gratitude (feminine noun)
* Portuguese: gratidão (feminine noun)
* Romanian: recunoștință (feminine noun)
Germanic Languages:
* German: Dankbarkeit (feminine noun)
* Dutch: dankbaarheid (feminine noun)
* Swedish: tacksamhet (feminine noun)
* Norwegian: takknemlighet (feminine noun)
* Danish: taknemmelighed (feminine noun)
* Icelandic: þakklæti (neuter noun)
Slavic Languages:
* Russian: благодарность (blagodarnost') (feminine noun)
* Polish: wdzięczność (feminine noun)
* Czech: vděčnost (feminine noun)
* Ukrainian: вдячність (vdjachnist') (feminine noun)
* Serbian: zahvalnost (feminine noun)
Other Languages:
* Japanese: 感謝 (kansha)
* Chinese (Mandarin): 感恩 (gǎn'ēn)
* Korean: 감사 (gamsa)
* Arabic: شكر (shukr)
* Hindi: आभार (aabhār)
* Turkish: minnettarlık (feminine noun)
Note: In some languages, the word for "gratefulness" can also be used to express the act of giving thanks.
This is not an exhaustive list, but it includes some of the most common languages. If you need to know the word for "gratefulness" in a specific language, you can always use an online translator or dictionary.