Kutarka is a Sanskrit word meaning “bad logician,” “sophistry,” or “fallacious argument” from ku, a root syllable meaning “deficiency,” and tarka, meaning “reasoning,” “inquiry” or “logic” or “speculation.”
In yoga and Indian philosophy, kutarka is negative logic or negative reasoning. It is the wrong logic used for the purpose of finding fault. According to Patanjali, author of the eightfold path of yoga in the Yoga Sutras, there are three types of logic, of which kutarka is the lowest form.
Using kutarka, the person will apply incorrect logic to reach a conclusion. For example, given the statements “God is love” and “love is blind,” the person using kutarka logic concludes that God is blind.