Japanese verbs can take the suffix -tai, which attaches to the ren'youkei form and turns the verb into an -i adjective, expressing desire to do what the verb says. I have recently wondered where this suffix comes from. Is it known? I mean, do we know where the -tai suffix in question comes from? Someone proposed it might be from -te + ai, love, as a comparison with how "oi", to love, means also to want in Hakka. Could that be?
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According to this article in Japanese WP, -たい is the descendant of Middle Japanese -たし (-tasi), which ultimately traces back to Old Japanese (or Proto-Japonic) いたし (itasi; "sore, acute").
A paper referred by that page argues that this form has changed its meaning taking the path of "painful" → "sorely felt" → "of physiological necessity" → "of emotional necessity" → "desire".
Someone proposed it might be from -te + ai, love...
It's unlikely to be true considering the oldest attested form of this word ended in -asi, not -ai. Additionally, if Japanese speakers want to incorporate Chinese words in such a way, they never use te-form but append them directly to word stem or 連用形. For instance, -そう in 「雨{あめ}が降{ふ}りそう」 is said to originate from 相{そう} ("appearance").
answered Apr 26 '15 at 15:00
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If ai is a Chinese loanword, what would the "indigenous", "original" Japanese word for love be? Perhaps koi?– MickGApr 27 '15 at 5:09
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1(1) Yes, the indigenous word for love should be "koi" (lit. "yearning"). "Ai" for "love" is relatively new, being an outcome of modern translation from Western languages. (2) It's "furisou"... I think I'd put furiganas on it. Your translation is correct. Apr 27 '15 at 5:30
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1@broccolifacemask, what of 愛づ【めづ】 (modern 愛でる【めでる】) as another Old Japanese word for "to love"? 2 days ago
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1@EiríkrÚtlendi Nice catch. I wouldn't say it exactly means "romantic love", but matches up very well with English love. 2 days ago