Jisho

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いちいせんしん 一意専心
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Adverb (fukushi), Noun, Noun which may take the genitive case particle 'no'
1. single-mindedly; wholeheartedly; with all one's heart; with one's heart and soul​Yojijukugo (four character compound)
Other forms
一意摶心 【いちいせんしん】
Notes
一意摶心: Rarely-used kanji form.

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