Jisho

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Adverb (fukushi)
1. further; farther; furthermore; all the more; even moreUsually written using kana alone
Other forms
尚一層 【なおいっそう】尚いっそう 【なおいっそう】猶一層 【なおいっそう】猶いっそう 【なおいっそう】
Notes
猶一層: Out-dated kanji or kanji usage. 猶いっそう: Out-dated kanji or kanji usage.

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