Jisho

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Adverb (fukushi), Na-adjective (keiyodoshi)
1. intently; single-mindedly; devotedly; solely; earnestly; with all one's heartUsually written using kana alone, See also ひたぶる
Other forms
一向 【ひたすら】頓 【ひたすら】
Notes
只管: Rarely-used kanji form. 一向: Rarely-used kanji form. 頓: Rarely-used kanji form.

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