"I have frequently detected myself in such kind of mistakes," said Elinor, "in a total misapprehension of character in some point or other: fancying people so much more gay or grave, or ingenious or stupid than they really are, and I can hardly tell why or in what the deception originated.
There are no more uses of "ingenious" in the book.
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It was an ingenious solution to the problem—as reliable as it was easy.
The first person to put wheels on a suitcase had an ingenious idea.