宁静 (níng jìng): เงียบสงบ

The countryside at night is very tranquil; you can only hear the insects chirping.

The lake surface is as tranquil as a mirror.

In this tranquil morning, I like to take a walk.

He longs for a tranquil life.

The library is very tranquil, suitable for studying.

After the storm, the sea returned to tranquility.