Lady Bertram constantly declined it; but her placid manner of refusal made Mrs. Rushworth still think she wished to come, till Mrs. Norris’s more numerous words and louder tone convinced her of the truth.
"Yes, she does look very well," was Lady Bertram’s placid reply.
In this more placid state of things William reentered, followed not far behind by his mother and Betsey.
There are no more uses of "placid" in the book.
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a ribbon of sand between the angry sea and the placid bay
I scan their faces, trying to look as placid as possible.