I'm wondering what the か in か弱い, か細い and similar words is. It seems to act as
an intensifier. The Daijisen tells me simply that this か is a 接頭語, and
translates it as いかにも; it doesn't seem to have its own entry or any further
explanation. Speculations online seem to include:

  * it is a corruption of 小【こ】, and so is a simple intensifier
  * it implies "obviously 弱い・細い _by sight_ "

My question: what does this prefix mean, and where does it come from? (For
bonus points: can anyone give me some more examples, and is this prefix still
productive?)
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etymology prefixes
What is the か in「か弱い」?
The best answer you might get with this is that it's "just a prefix." I cannot
find any indications of the origins, but it is included in
[dictionaries](http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=%E3%81%8B&dtype=0&dname=0na&stype=1&pagenum=21&index=02709300)
and defined simply as a prefix that strengthens meaning:

> ［接頭］主として形容詞に付いて、意味を強め、語調を整える。「―弱い」「―細い」「―黒い」

I can only find the one page with the theory that it comes from 小 so I don't
know how much validity we can give it. It's probably just an old prefix that
fell out of use but remains as a relic in a few set words.

I welcome anyone who can prove me wrong, though.
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弱い or 細い sounds straightforward and a little intense to us Japanese.

This prefix "か" soften the meaning and add some "kawaii".

So か弱い or か細い is a euphemistic expression for something "kawaii".

e.g.

か弱い女の子 weak (and kawaii, or lovable, adorable) girl

か細い声 weak (and kawaii, or lovable, adorable) voice
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2013-07-24T14:19:55.793
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I can't really tell you where か comes from, but I do think I can give a name
to this sort of prefix. They're sometimes called 発語 (はつご or ほつご), and there
are other examples of this category besides just か, including い, お, さ, そ, た,
and み.

Here's how 明鏡国語辞典 defines 発語{はつご}:

> 語調を整え、軽い意味を添える接頭語。「さ霧」「か細い」「そ知らぬ」の「さ」「か」「そ」など。

And here's how 精選版 日本国語大辞典 defines it:

> 語調を整えたり、ある意味を添えたりするために語のはじめに付けることば。「み雪」「お田」「さ迷う」などの、「み」「お」「さ」などの類。ほつご。

We can find other examples besides the ones in these dictionary entries. For
example, I found an old example for た in 広辞苑, 「た易し」. Another example I found
in 精選日国 is in the entry for 維新, which says "「維」は「これ」の意の発語".

Of course, the more general term 接頭語 is probably more common, and I'm not sure
if 発語 can be said to form a coherent category, but I thought I'd write about
this term anyway in case it was helpful :-)
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