Subtitles section Play video Print subtitles What is The argument from ignorance (appeal to ignorance, argumentum ad ignorantiam) ? The argument from ignorance, also known as appeal to ignorance or argumentum ad ignorantiam, is a fallacy that occurs when something is claimed to be true simply because it has not been proven false, or vice versa. This fallacy asserts that a lack of evidence against a position is evidence for it, or that an argument is necessarily false because it has not been proven true. Everyday Example: An individual claims that there must be life on other planets because no one has been able to prove definitively that there isn't. In this instance, the person is basing their belief on the absence of evidence to the contrary rather than on positive evidence supporting the existence of extraterrestrial life. This argument assumes that the lack of disproof is equivalent to proof, which is a logical fallacy.