The story
- Latin · derived fromtranquillus
- Middle French · borrowed fromtranquille
- English todaytranquil
Borrowed from Middle French tranquille, from Latin tranquillus, from trāns- + the root of quiēs (“rest, quiet, peace”), ultimately from *kʷyeh₁- (“to rest”).
Etymology from Wiktionary, CC BY-SA 4.0.