Tranquil

Tranquil
The word tranquil has a very straightforward definition: free from commotion, calm, and quiet. This adjective is used to describe peaceful places that we find ourselves, such as nature, or more specifically, a calm-water lake. On the other hand, the noun form, tranquility, is the state of being peaceful or serene. And this word is used when there is calming action taking place, such as sleeping or relaxing. One instance of a tranquil text would describe relaxing in a hot tub on a bright summer’s day, just relaxing and enjoying life. 
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Examples: Two examples of tranquility can be found in the haiku by Matsunaga Teitoku located in the Anthology of The Classic Tradition of Haiku.
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“For all alike 
The cause of the noontime napping 
Is the summer moon”
This example acts as two separate examples since it incorporates two aspects of my definition of tranquility. The haiku above demonstrates both the peaceful aspect of nature by mentioning summer and by talking about the calming action of napping.