Not excited or emotionally agitated
Motionless and undisturbed
Her features were more defined and had a calm, soft, and serene expression.
Evelyn appeared serene and perfect, as usual.
In more serene surroundings perhaps we could come to some understanding and move forward in a mutually peaceful way.
Perhaps I may prove useful to your Serene Highness.
Commerce is unexpectedly confident and serene, alert, adventurous, and unwearied.