He was, perhaps, but at treacherous play with her.
Mr. Crawford was no longer the Mr. Crawford who, as the clandestine, insidious, treacherous admirer of Maria Bertram, had been her abhorrence, whom she had hated to see or to speak to, in whom she could believe no good quality to exist, and whose power, even of being agreeable, she had barely acknowledged.
There are no more uses of "treacherous" in the book.
Show samples from other sources
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.