Fallacy · Slippery words and shapes
Weak analogy
Also called: False analogy
Arguing that two things are alike in one way because they are alike in others, when the differences matter.
What it is
Analogies are useful for understanding, and many arguments rely on them. An analogy is only as strong as the similarities that matter for the point. If the two cases differ in exactly the way that counts, the conclusion does not carry over.
An example
“Employees are like nails: you have to hit them on the head to make them work.” People respond to fair treatment in ways nails do not.
How to spot it
List the ways the two cases differ, and ask whether any of those differences matter for the conclusion.
How to answer it
“They’re alike in some ways, but they differ in the one that matters here: …”
When it is not a fallacy
A strong analogy, alike in the respects that matter, is good evidence. Much of the law works by comparing cases.
Printable sheet of all fallacies
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A plain reference you can paste into notes or an essay:
Quest2Reason. “Weak analogy.” https://quest2reason.com/learn/ideas/fallacies/weak-analogy. Accessed 13 November 2026.