A weak analogy, also called a false analogy, faulty analogy, and questionable analogy, is an informal logical fallacy that is based on faulty use of an analogy. The fallacy takes the following form:
- A is like B in some way.
- B has property P.
- Therefore, A also has property P.
The argument is fallacious because A and B could be different in a way that is relevant to whether A has property P. In other words, everything is "like" everything else in some way, but not all things share the same properties. A common humorous example is "God is love; love is blind; Stevie Wonder is blind; therefore, Stevie Wonder is God."
See also Fallacy of analogy.