calm

If a person, place or situation is calm, it is peaceful and quiet.

Example: There's no wind and the lake is calm.

The state of being quiet and peaceful.

Example: I felt a calm come over me.

A period of time without wind.

Example: The calm before a storm.

To make someone or something calm.

Example: He was yelling and running around but I calmed him.

When someone or something becomes calm.

Example: The lake calmed after the storm.