Everywhere the brick houses have a mellow look, and in Mrs. Glegg’s day there was no incongruous new-fashioned smartness, no plate-glass in shop-windows, no fresh stucco-facing or other fallacious attempt to make fine old red St. Ogg’s wear the air of a town that sprang up yesterday.
…her loan of five hundred pounds, it naturally occurred to him that he had a promissory note for three hundred pounds lent to his brother-in-law Moss; and if the said brother-in-law could manage to pay in the money within a given time, it would go far to lessen the fallacious air of inconvenience which Mr. Tulliver’s spirited step might have worn in the eyes of weak people who require to know precisely how a thing is to be done before they are strongly confident that it will be easy.
There are no more uses of "fallacious" in the book.
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She reached a false conclusion that was based on fallacious reasoning.
You can’t convict him based on the fallacious testimony of one witness.