characterized by absence of emotional agitation; "calm acceptance of the inevitable"; "remained serene in the midst of turbulence"; "a serene expression on her face"; "she became more tranquil"; "tranquil life in the country"
Someone or something that is serene is calm and quiet. She looked as calm and serene as she always did + serenely se·rene·ly We sailed serenely down the river + serenity se·ren·ity I had a wonderful feeling of peace and serenity when I saw my husband. very calm or peaceful (serenus )