専せん心しん一いち意い

noun, adverb

single-mindedly; wholeheartedly; with heart and soul

A yojijukugo used to describe devoting oneself entirely to a single purpose, often with strong emotional commitment. Can function as a noun or adverbially with に.

• 彼かれは専せん心しん一いち意いに研けん究きゅうに打うち込こんだ。

  He devoted himself single-mindedly to his research.

• 専せん心しん一いち意いの努ど力りょくが実みを結むすんだ。

  Their wholehearted efforts bore fruit.