What is the longest (based on their representation in romaji) word in
Japanese? Are there any longer than
[リュウグウノオトヒメノモトユイノキリハズシ](http://answers.yahoo.com/question/index?qid=20090724124743AAzBwo1)?
If it depends on criteria for a word, then list them by their criteria.

**Background:** I'm wanting to use a long word for a JRuby bug report, and I
think that floccinaucinihilipilification is pretty worthless. Wikipedia's
article on [Longest words (by
language)](http://en.wikipedia.org/wiki/Longest_words) is currently lacking an
entry for Japanese.
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words
What is the longest word in Japanese?
Well, I found the [following
question](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1411588604)
which includes some pretty long words/names:

  1. タウマタファカタンギハンガコアウアウオタマテアポカイフェヌアキタナタフ 
  2. 愛知県海部郡飛島村大字飛島新田字竹之郷ヨタレ南ノ割 
  3. ランヴァイル・プルグウィンギル・ゴゲリフウィルンドロブル・ランティシリオゴゴゴホ 

And a site with some more (though it's based on kanji): [Long 1-kanji
words](http://f7.aaacafe.ne.jp/~kanji/long.html)

sorry for not linking, not enough rep...

According to the link you gave リュウグウノオトヒメノモトユイノキリハズシ is a name of a sea weed,
compromised of more then one word, so I guess some of the stuff here pass...

Edit: The [Japanese wiki
page](http://ja.wikipedia.org/wiki/%E9%95%B7%E5%A4%A7%E8%AA%9E) for really
long words have some more really long words like 英国国教会の廃止に反対する主義. it's one
word in English ("antidisestablishmentarian-ism"), but I'm not sure it can be
considered as such in japanese.
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One can always recursively create infinitely long Japanese verbs by sticking
on agglutinative markers:

> 食べられられられられられられられられ...られる
>
> おいしくなくなくなくなくなくなくなく...ない
>
> 連れていってきていってきていってきて...いく

Obviously they don't mean anything useful but since phrases like `he is going
to go to go to go to go` or `it is not not not not not not bad` is one word in
Japan word length is theoretically unbounded.
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My friend, when teaching Japanese in English, found out about a long verb,
"arawaresasewaremashta" in an old book. It means "the river spontaneously
appeared", but I'm not sure if it is still used.
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One of the cast name of the traditional Japanese comedy 落語：

じゅげむじゅげむごこうのすりきれかいじゃりすいぎょのすいぎょうまつうんらいまつふうらいまつくうねるところにすむところやぶらこうじのやぶこうじぱいぽぱいぽぱいぽのしゅーりんがんしゅーりんがんのぐーりんだいぐーりんだいのぽんぽこぴーのぽんぽこなーのちょうきゅうめいのちょうすけ
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![enter image description here](https://i.stack.imgur.com/6H6fr.jpg)

This is probably the longest word I found in the Kanji application Kanji Tree.
It describes the phase "no use to cry over spilled milk"
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