calmness
US /ˈkɑːm.nəs/
UK /ˈkɑːm.nəs/

1.
calme, sérénité, tranquillité
the state of being peaceful, quiet, and without worry
:
•
She found a sense of calmness in nature.
Elle a trouvé un sentiment de calme dans la nature.
•
Despite the chaos, he maintained his calmness.
Malgré le chaos, il a maintenu son calme.