"he accepted their problems with composure and she with equanimity"
"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"
"calm seas"
"quiet the dragons of worry and fear"
"steady yourself"
"After the fight both men need to cool off."
"It took a while after the baby was born for things to settle down again."
"The patient must be sedated before the operation"