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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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Here is the page that I believe he's referring to with regard to speculation: detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1430062554 –  ssb Jul 23 '13 at 3:59
Yes, they were all unjustified and unreferenced, so I didn't bother to include links. –  Billy Jul 23 '13 at 5:14
[The following contains speculation] 全訳古語辞典「か〈接頭〉(主に形容詞又は動詞に付いて)語調を整え又は語意を強める  『か青』『か弱し』『か寄る』」 So it could be used with verbs. 精選版日本国語大辞典 tells us か寄る is used within the Manyoushuu(512), so this prefix is quite old, and its etymology hard to trace. It speculates か with verbs here could be 斯く. Wherever it may come from, could its use with adjectives have developed from this? If so, it must be old indeed, for か黒き occurs in the Manyoushuu(15) as well. My (wild) guess is that being monosyllabic, its origin is mimetic (=sounds emphatic). This sound contains emphasis in the mimetic かっと(なる). –  blutorange Jul 23 '13 at 6:52
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2 Answers

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 and defined simply as a prefix that strengthens meaning:


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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I suspect the 小 theory is nonsense too, but it's among the more believable theories I found! か黒い is new to me. Thanks. –  Billy Jul 23 '13 at 4:50
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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".


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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Thanks for your answer. :) –  Billy Jul 25 '13 at 1:01
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