Synset

not agitated; without losing self-possession
<adj.all>   freq. cnt.: 11 freq. cnt.: 11

calm

serene

tranquil

unagitated

sample sentences

"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"