Full Idea
The ways in which different kinds of thing are similar to one another aren't, in general, similar to one another.
Gist of Idea
The different types of resemblance don't resemble one another
Source
Jerry A. Fodor (LOT 2 [2008], Ch.5.4)
Book Reference
Fodor,Jerry A.: 'LOT 2: the Language of Thought Revisited' [OUP 2008], p.157
A Reaction
Nice, but I think one would say that they lack similarity at the level of primary thought, but have obvious similarity (as concept-connectors) at the level of meta-thought.
Related Idea
Idea 4441 'Resemblance Nominalism' won't work, because the theory treats resemblance itself as a universal [Russell]