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I quite like the expression "... eludes me" (or in French "... m'échappe"). I
can express this with something like 分からない, 理解できない but this is not faithful to
the expression "... eludes me".

Indeed, "... eludes me" describes something that you can't catch, the thing
itself try to not come close to you so as not to be caught. That is the thing
eludes you on its own. On the other hand, 理解できない or わからない only tells that you
can't understand but misses the nuance that the thing tries not to be caught.

Is there a word in Japanese that matches this nuance?
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2016-05-22T09:35:18.630
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word-requests
The answer to this question eludes me
The first phrase that comes to mind is:

> 「ピンと[来]{こ}ない」

or

> 「いまいちピンと来ない」

At least those are natural-sounding phrases often used by native speakers (and
are less boring and far less dictionary-like than [理解]{りかい}できない or わからない).
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2016-05-22T09:53:44.153
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From the 3. of the following definitions of “elude” of Oxford English
Dictionary, it’s not unreasonable to interpret “elude” as “fail to be
understood” or “not understandable.”:

  1. Escape from or avoid (a danger, enemy, or pursuer), typically in a skillful or cunning way.
  2. (Of an achievement or something desired) fail to be attained by (someone). 
  3. (Of an idea or fact) fail to be understood or remembered by (someone), e.g. the logic of this eluded most people.

But if you stick to the nuance that "something that you can't catch /
something that tries not to be caught,” “捉えどころがない” and "把握できない” can be
alternative possibilities as used in ”彼の文章は捉えどころがない – His writing is elusive,
” and “言葉の意味が把握できない – I can’t catch the meaning of the word.”
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2016-05-23T00:37:10.370
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You can say:

> ちょっとビミョー

`ビミョー` can actually mean a lot of things such as somewhat awkward, strange. In
some dictionaries, ビミョー is defined as "subtle".

However, you can somewhat express 理解できない with nuance of "... eludes me" this
way in an informal conversation.

A: 分かった？

B: ちょっとビミョー～
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2016-05-24T00:27:20.143
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I don't know if they are enough faithful to your nuance but:

  * 要領【ようりょう】を得【え】ない  
You can't get to point from what they say, but often is blaming on poor
explanation.

  * 雲【くも】をつかむよう (na-adj.)  
Felt like hard to focus into an image, because of vagueness or unfamiliarity.

  * 晦渋【かいじゅう】 (na-adj.)  
A bookish word that means overly obfuscating.

  * 難解【なんかい】 (na-adj.)  
Another relatively bookish word "incomprehensible."
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2016-05-24T15:05:45.563
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