一いっ心しん不ふ乱らん

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Freq.FrequencyTop 50,000

Meanings

1

na-adjective, noun

wholeheartedly; single-mindedly; with intense concentration

yojijukugo (four-character idiom)

Describes doing something with complete focus and dedication, without distraction. Often used with verbs like 取り組む, 勉強する, 祈る.

彼かれは一いっ心しん不ふ乱らんに研けん究きゅうに取とり組くんでいる。

He is wholeheartedly engaged in his research.

試し験けん前まえ、彼かの女じょは一いっ心しん不ふ乱らんに勉べん強きょうした。

Before the exam, she studied with intense concentration.

Kanji

一one, one radical (no.1)
心heart, mind, spirit
不negative, non-, bad
乱riot, war, disorder

Related words

余よ念ねん
一心不乱 is a more literary na-adjective/adverb meaning 'with undivided, single-minded attention', whereas 余念(がない) is the everyday phrase for the same state of total absorption.
無む我が夢む中ちゅうN1
一心不乱 stresses single-minded, undistracted concentration on a goal, while 無我夢中 stresses losing awareness of oneself entirely, often under excitement or pressure.
黙もく々もくN1
一心不乱 stresses single-minded concentration without necessarily implying silence, while 黙々 specifically highlights doing something quietly and without talking.

Etymology

A yojijukugo composed of 一心 (one heart/mind) and 不乱 (without disorder). The exact historical origin is uncertain, but it conveys the idea of a mind unified and undisturbed.