tranquil

Adjective

• not agitated; without losing self-possession
  • spoke in a calm voice
    
  • remained calm throughout the uproar
    
  • he remained serene in the midst of turbulence
    
  • a serene expression on her face
    
  • she became more tranquil
    
  • tranquil life in the country
    

• (of a body of water) free from disturbance by heavy waves
  • a ribbon of sand between the angry sea and the placid bay
    
  • the quiet waters of a lagoon
    
  • a lake of tranquil blue water reflecting a tranquil blue sky
    
  • a smooth channel crossing
    
  • scarcely a ripple on the still water
    
  • unruffled water
    

Related words

• Synonyms: 
  calm , unagitated , serene , placid , quiet , still , smooth , unruffled