He is no more crazy than you are.


The sentence above, which does it mean between A and B? I guess it should mean A, because "James is no taller than Brown" means that "James is short and Brown is short, too".

A: He is as right-minded as you are.

B: He is not crazy and you are not crazy either.
pructusHe is no more crazy than you are.
It can be used both ways: neither of you is crazy / both of you are crazy.
Context will determine which is intended.

It could be, "Each of you is a little bit crazy," since "crazy" is not an absolute.

Your point about the two comparative forms is correct. You could say, "He is no crazier than you are."
I Had The Craziest Dream

Actually, we do use the expression with absolutes, to mean "absolutely not."
She is no more pregnant than you are!

In these cases it takes on the form of an idiom, I believe.
pructusHe is no more crazy than you are.
There is a literal meaning:

The degree to which he is crazy is not greater than the degree to which you are crazy.

And there is a pragmatic meaning, provided that this is said, as it usually is, to someone who is not crazy:

He, like you, is not crazy.

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