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Use "placidness" in a sentence
"Wanting to fill my eyes and thoughts with beauty as I began chemotherapy, I pored over art books and absorbed the placidness of Monet's garden, the sparkling color of the Impressionists, the strength and solidity of"
"Whenever he came in my sight, the thought of this gave me an indignation that made his presence disgustful to me; and the more, as I fancied I beheld in his face a triumph which reproached my weakness on that account; although perhaps it was only the same vivacity and placidness that generally sit upon his features."
"Would you expect to enjoy yourself with your usual placidness, and not to be ruffled, in an hurricane which every moment threatens to blow your house down?"