Very calm is "très calme" in French
Calme.
Je suis calme.
du calme!
Du calme, du calme.
tu dois te calmer / vous devez vous calmer
"Je devais rester calme."
You can say "calm down" in different ways such as "take a deep breath," "relax," or "stay calm."
In Hawaiian, you would say "hoʻomaluhia".
calmant, calmante
The feminine form of "calmer" in French is "calme" for both masculine and feminine subjects.
"Calm" in Hawaiian is "maluhia."