...they invented some of the machines that have since troubled the world, especially the ingenious devices for killing large numbers of people at once,
We shall soon before the break of day start on our long journey, a journey from which some of us, or perhaps all of us (except our friend and counsellor, the ingenious wizard Gandalf) may never return.
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.