fallacious

But such disparagement was itself a kneejerk reaction, and it was fallacious.

Some care, however, is necessary in applying this test, as in the hands of inexperienced persons it is sometimes fallacious.

She evidently made up her mind that logic was a fallacious mode of inference, and determined to abandon it for the future.

It appears to me that the fallacious reasoner, in his private thoughts, would not be likely to proceed beyond the first step.