It is true that some of the delighted congregation thought that this referred to Mayor Pugh, and others applied it to F. X. Jordan, but wise citizens saw that it was a courageous attack on that monster of treacherous lewdness, Dr. Arrowsmith.
There are no more uses of "treacherous" in the book.
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The road through Afghanistan’s Kabul gorge is even more treacherous than the Road of Death in Bolivia.
It’s a gorgeous beach, but the waves are treacherous in the water.