Calm

means,

Still, tranquil, quiet;
   free from motion, agitation,
or disturbance
of the elements
or passions

And when He was entered into a ship,
His disciples followed Him. 
And behold, there arose a great tempest in the sea, insomuch that the ship was covered with the waves: but He was asleep. 
And His disciples came to Him , and awoke Him, saying, Lord, save us: we perish. 
And He saith unto them, Why are ye fearful,
O ye of little faith
Then He arose,
and rebuked the winds and the sea;
and there was
a great calm...
Matthew  
  8:23-26