His mathematics and physical chemistry were now as sound as Terry’s, his indifference to publicity and to flowery hangings as great, his industry as fanatical, his ingenuity in devising new apparatus at least comparable, and his imagination far more swift.
When he took up diffusion problems, he began to develop his own apparatus, and whether it was from inborn ingenuity or merely from a fury of labor, he was so competent that he won from Terry the almost overwhelming praise: "Why, that’s not so darn’ bad, Slim!" The sureness to which Max Gottlieb seems to have been born came to Martin slowly, after many stumblings, but it came.
There are no more uses of "ingenuity" in the book.
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He exercised great ingenuity in making excuses for missing class.
It will take more than ingenuity to clean this up. We’re going to have to admit our mistake.