Definition of tranquil

adjective (a)

• Quiet; calm; undisturbed; peaceful; not agitated; as, the atmosphere is tranquil; the condition of the country is tranquil. (adjective)

  source: webster1913

adjective satellite (s)

• (of a body of water) free from disturbance by heavy waves (adj.all)

  Synonym: placid, quiet, smooth, still, unruffled
  

  Example:
  A lake of tranquil blue water reflecting a tranquil blue sky.
  

  source: wordnet30
• not agitated; without losing self-possession (adj.all)

  Synonym: calm, serene, unagitated
  

  Example:
  She became more tranquil.
  Tranquil life in the country.
  

  source: wordnet30

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