Calm
Nearly or completely motionless; undisturbed: the calm surface of the lake.
Not excited or agitated; composed: The President was calm throughout the global crisis.n.
An absence or cessation of motion; stillness.
Serenity; tranquillity; peace.
A condition of no wind or a wind with a speed of less than 1 mile (2 kilometers) per hour, according to the Beaufort scale.