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One of the most useful turns of phrase in Japanese is `ありがた迷惑{めいわく}`, which is
that of being helpful in a way that is not helpful. It can cover situations
where one is being helpful to semi-deliberately cause guilt (Hi mom!), or
situations where the helper is sincere but causing more harm than good.

For a long time I pronounced it as `ありがたい めいわく`, because I assume it was a
combination of "grateful" and "troublesome".

Since learning the correct way of saying it, I've always wondered, why is
there no `い` at the end of `ありがた`?
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2011-07-22T07:45:35.413
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2016-01-10T02:37:42.383
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set-phrases spelling
Where's the missing い in ありがた迷惑【ありがた　めいわく】?
ありがた迷惑 is not two separate words. It is one word, a compound noun. When you
make a compound noun like this in Japanese, you only use the stem of the
adjective. The stem of ありがたい is ありがた, so this gets added to 迷惑 and you end up
with ありがた迷惑.

Here are some similar examples of "adjective stem + noun" compound nouns, and
the equivalent "adjective, noun" two-word constructions:

  * 黒髪 (くろかみ) vs 黒い髪 (くろいかみ)
  * 細身 (ほそみ) vs 細い身 (ほそいみ)
  * 嬉し涙 (うれしなみだ) vs 嬉しい涙 (うれしなみだ)
  * 早口 (はやくち) vs 早い口 (はやいくち)

In each of these cases, the two-word noun-phrase form (on the right) is a
_syntactically_ correct construction. But because the compound noun (on the
left) has been lexicalized (become a word in its own right), it will usually
have taken on some meaning or nuance of its own, diverging from the two-word
construction to a greater or lesser degree. (And of course the fact that one
is a noun and the other is a multi-word noun phrase can in itself have
implications for how they interact with other words in a phrase or sentence.)
So the two constructions are not interchangeable, even though they are
obviously related.

All this applies to other types of compound nouns, too, e.g. 行き先 vs 行く先 etc.

In the case of ありがたい迷惑, I would hypothesize that ありがた迷惑 is so strongly
lexicalized that in the majority of cases, unless it was clear that you were
using the form ありがたい迷惑 intentionally for effect, people would simply assume
that you meant to say ありがた迷惑 and misspoke.
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2011-07-22T08:15:55.600
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answer