1. (

• calm ,
• unagitated ,
• serene ,
• tranquil

) 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" ;

2. (

• serene

) completely clear and fine; "serene skies and a bright blue sea" ;