They loved fearlessly; they tramped through the mountains and came back to revel in vast bathrooms and ingenious dinners; they idled before cafes, and save when he fell silent as he remembered how much Leora had wanted to sit before cafes in France, they showed each other all the eagernesses of their minds.
President Truscott said, "Really, I’m too engrossed to consider chimerical schemes, however ingenious they may be.
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.