Слово "calmness". Англо-русский словарь Мюллера

“Nothin’,” he said slowly, with a careless calmness that was assumed, “only goin’ to keep that promise I made.

When we passed the last point of the jetty and the last black rock, I could feel a great calmness creep over me, a calmness that increased the farther we left land behind us.

The very anticipations of delight to be enjoyed in his forthcoming visits—the bright, pure gleam of heavenly happiness it diffused over the almost deadly warfare in which he had voluntarily engaged, illumined his whole countenance with a look of ineffable joy and calmness, as, immediately after Villefort's departure, his thoughts flew back to the cheering prospect before him, of tasting, at least, a brief respite from the fierce and stormy passions of his mind.

Tease calmness of manner and presence of mind!

"But not until two o'clock," said d'Artagnan, with the same calmness.