how best to say that a kanji such as 句 has ONLY 音読み , i.e., there is NO kun-yomi.
I want to tag posts at https://www.facebook.com/kanjirecog to indicate this without using romaji or English ... is のみ the best way to say ONLY here ?
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Native speaker here (if that means anything).
「読みは音読みのみ」 is surely grammatical and it conveys perfectly what needs to be said. However, it might sound a little awkward to some people with three み's (and two 読み's) in such a short phrase. 「のみ」 itself is a very good word choice even though it is adding another み and this is clearly no place for the informal 「だけ」.
I am going to say that you could keep it as is. It is not as though one would need to say 「読みは音読みのみ」 three times in a row in one breath.