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