calm

Steadiness of mind under stress.

Wind moving at less than 1 knot; 0 on the Beaufort scale.

Make calm or still.

Become quiet or calm, especially after a state of agitation.

Cause to be calm or quiet as by administering a sedative to.

Make steady.

Not agitated; without losing self-possession.

“spoke in a calm voice”

“remained calm throughout the uproar”

(of weather) free from storm or wind.

“calm seas”