...His serene philosophy and gentle placidity could in no way be disturbed by the opening or shutting of a door, or by the bearer of good or evil tidings... 
Baroness Emmuska Orczy 「The Elusive Pimpernel」
...Crusoe did look with amiable placidity, as though to say, “Howl away, old boy, I won’t budge till Dick does...
R.M. Ballantyne 「The Dog Crusoe and his Master」
... The placidity of Nature was, however, to the hunted convict a new source of alarm...
Marcus Clarke 「For the Term of His Natural Life」
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