adjective/tʁɑ̃.kil/
calm, quiet, tranquil, still, peaceful, serene
Synonyms: calme, serein
Antonyms: agité
Related: avoir la conscience tranquille, laisser tranquille, long fleuve tranquille, tranquillement, tranquilliser, tranquillité
From Middle French tranquille (15th c.), a borrowing from Latin tranquillis.