Mrs. Guppy, whose incessant smiling gave her quite a waggish appearance, did as her son requested and then sat down in a corner, holding her pocket handkerchief to her chest, like a fomentation, with both hands.
There are no more uses of "incessant" in the book.
Show samples from other sources
She grew annoyed by the child’s incessant questions.
Night and day we live with the incessant noise of the city.