形容词

1. 平静的;宁静的;安详的
Someone or something that is serene is calm and quiet.

1. completely clear and fine

e.g. serene skies and a bright blue sea

2. not agitated
without losing self-possession

e.g. 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

Synonym: calmunagitatedtranquil