一心不乱

Meanings

1. Na-adjective, Noun

   wholeheartedly; with heart and soul; intently; with undivided attention; with intense concentration; single-mindedlyFour-character idiom

• 自分じぶんの仕事しごとに一心不乱いっしんふらんに打うち込こみなさい。

  Give yourself to your work with body and soul.

• 一心不乱いっしんふらんに仕事しごとに取とり組くむのは良よいけれど、まわりが全然ぜんぜん見みえてないね。

  It's good to be able to concentrate single-mindedly on your work, but you're completely ignoring the people around you.