Vocabulary
一心不乱
いっしんふらん
wholeheartedly; with heart and soul; intently; with undivided attention; with intense concentration; single-mindedly
na-adjective
noun
freq #43
Example sentences
自分（じぶん）の仕事（しごと）に一心不乱（いっしんふらん）に打ち込（うちこ）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.