X wa Y ga suki desu


I read several times that an expression such as "X wa Y ga suki desu", where
say both X and Y are people, is inherently ambiguous and can be understood as
either "X likes Y" or "Y likes X", according to the context.

If that's correct, then I'm wondering how that ambiguity is "felt"
grammatically in terms of the meaning of suki. As I understand it, suki is a
na-adjective that simply means "liked" or "preferred". If "X wa Y ga suki
desu" is ambiguous, is "suki-na X" also ambiguous? Can it mean not only "X
that is liked" but also "liked by X"?




"X wa Y ga suki desu" **always** means "X likes Y" unless you're in a very
special context.

It's actually theoretically possible that this effectively means "Y likes X"
in a certain special context where _ga_ works as the exhaustive-listing marker
(See [this question](https://japanese.stackexchange.com/q/22/5010) for
exhaustive-lisging _ga_ ):

> **A** : I know either Y or Z likes X. Which? Who likes X?  
>  **B** : X wa Y ga suki desu. (It's Y who likes X.)

B's answer would be pronounced with a different intonation from the normal "X
wa Y ga suki desu".

Nevertheless, people will rarely make a question like this, and I don't know
if this really is what you have read. And even when people make such a
question, I doubt you would ever hear an answer like this actually used in
real life. There is a better, clearer way to put this. This answer would be
far more natural when said like this:

> **B** : [X no koto](https://japanese.stackexchange.com/q/2102/5010) wa Y ga
> suki desu. (It's Y who likes X.)

* * *

A similar expression can also be ambiguous when it forms a relative clause. I
think these pages answers your question about "suki-na X":

  * [Ambiguity in meaning of sentences with a noun qualifed by an adjective with が particle](https://japanese.stackexchange.com/q/23644/5010)
  * [が in subordinate clauses](https://japanese.stackexchange.com/q/30171/5010)

