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likely to betray; or guilty of betrayal
- Felix soon learned that the treacherous Turk, for whom he and his family endured such unheard-of oppression, on discovering that his deliverer was thus reduced to poverty and ruin, became a traitor to good feeling and honour and had quitted Italy with his daughter, insultingly sending Felix a pittance of money to aid him, as he said, in some plan of future maintenance.Chapter 14 (73% in)
There are no more uses of "treacherous" in Frankenstein.
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