serene

Adjective

• completely clear and fine
  • serene skies and a bright blue sea
    

• 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
    

Related words

• Synonyms: 
  calm , unagitated , tranquil