Is 暖かった standard Japanese?


I know Google hits aren't necessarily reliable, but I nonetheless searched for
the following two forms:

  * [暖かかった](https://www.google.com/search?hl=ja&q=%22%E6%9A%96%E3%81%8B%E3%81%8B%E3%81%A3%E3%81%9F%22) \- 約 2,770,000 件
  * [暖かった](https://www.google.com/search?hl=ja&q=%22%E6%9A%96%E3%81%8B%E3%81%A3%E3%81%9F%22) \- 約 2,810,000 件

The numbers are much further apart if I search for the -い form:

  * [暖かい](https://www.google.com/search?hl=ja&q=%22%E6%9A%96%E3%81%8B%E3%81%84%22) \- 約 41,900,000 件
  * [暖い](https://www.google.com/search?hl=ja&q=%22%E6%9A%96%E3%81%84%22) \- 約 97,500 件

As I understand it, 暖かった is considered prescriptively incorrect because it
looks like the past form of the non-existent adjective ×あたたい. However, if this
form has really become more common than 暖かかった, then I suppose it's an
acceptable form. Unfortunately, [I can't base that conclusion on Google hits
alone](https://japanese.meta.stackexchange.com/questions/522/google-counts-
may-not-be-as-reliable-as-you-imagine), so I decided to ask here. My guess is
that it's easier to say あたたかった than あたたかかった, so one of the かs gets dropped.

If you _can_ drop the か, I'm curious whether you can contract あたた to あった at
the same time, as in option four below:

  1. [あたたかかった](https://www.google.com/search?hl=ja&q=%22%E3%81%82%E3%81%9F%E3%81%9F%E3%81%8B%E3%81%8B%E3%81%A3%E3%81%9F%22) \- 約 122,000 件
  2. [あたたかった](https://www.google.com/search?hl=ja&q=%22%E3%81%82%E3%81%9F%E3%81%9F%E3%81%8B%E3%81%A3%E3%81%9F%22) \- 約 211,000 件
  3. [あったかかった](https://www.google.com/search?hl=ja&q=%22%E3%81%82%E3%81%A3%E3%81%9F%E3%81%8B%E3%81%8B%E3%81%A3%E3%81%9F%22&nfpr=1) \- 約 395,000 件
  4. [あったかった](https://www.google.com/search?hl=ja&q=%22%E3%81%82%E3%81%A3%E3%81%9F%E3%81%8B%E3%81%A3%E3%81%9F%22) \- 約 376,000 件

Are all four of these forms in common usage? Are some of them considered non-
standard or colloquial?




There's no such word as あたたかった/あったかった at least in standard Japanese...^^ You'd
surely be corrected if you wrote あたたかった in your essay or written test in
primary school. You wouldn't find あったかった in children's books, too. I believe
it's just a typo and doubt people (who speak Kanto or Kansai dialect at least)
really use it in normal or casual conversations.  
  
あたたかった appears in the song 「君に逢いたくて」by Gackt, but many people have pointed out
that it's wrong Japanese, for example
[here](http://www.nicovideo.jp/watch/sm15701027),
[here](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1160747731)
and [here](http://www.sam.hi-ho.ne.jp/~shuno/speech/050109.htm).  
  
It seems pretty hard for young children to pronounce あたたかかった/あったかかった,
especially the たた and かか parts, so I think they tend to pronounce it as
あたたかった/あったかった. I don't know if the あたたかった/あったかった used online is new internet
slang, and I suspect some of its writers might be imitating children's speech,
trying to sound childlike or cute.  
  
As for [暖]{あたた}かい/[暖]{あたた}かかった or [暖]{あたたか}い/[暖]{あたたか}かった, I normally use the
former because I was taught to write it that way and also because I've seen it
written that way more often. Maybe the latter is more used by older
people...^^




There's no such word as あたたかった/あったかった at least in standard Japanese...^^ You'd
surely be corrected if you wrote あたたかった in your essay or written test in
primary school. You wouldn't find あったかった in children's books, too. I believe
it's just a typo and doubt people (who speak Kanto or Kansai dialect at least)
really use it in normal or casual conversations.  
  
あたたかった appears in the song 「君に逢いたくて」by Gackt, but many people have pointed out
that it's wrong Japanese, for example
[here](http://www.nicovideo.jp/watch/sm15701027),
[here](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1160747731)
and [here](http://www.sam.hi-ho.ne.jp/~shuno/speech/050109.htm).  
  
It seems pretty hard for young children to pronounce あたたかかった/あったかかった,
especially the たた and かか parts, so I think they tend to pronounce it as
あたたかった/あったかった. I don't know if the あたたかった/あったかった used online is new internet
slang, and I suspect some of its writers might be imitating children's speech,
trying to sound childlike or cute.  
  
As for [暖]{あたた}かい/[暖]{あたた}かかった or [暖]{あたたか}い/[暖]{あたたか}かった, I normally use the
former because I was taught to write it that way and also because I've seen it
written that way more often. Maybe the latter is more used by older
people...^^

