遺憾なく

• Reading: いかんなく
• Romaji: ikannaku
• Kanji breakdown: 遺 (i) — leave behind; 憾 (kan) — regret
• Pronunciation: /i.kaɴ.na.kɯ/

Meaning

Fully; to the utmost; completely; without reserve. Used to describe doing something to its fullest extent.

An adverb formed from 遺憾 (regret) + なく (without). Paradoxically, 遺憾なく means 'without leaving any regret' — i.e., fully, completely, without holding back. The phrase 遺憾なく発揮する (to demonstrate to the fullest) is highly common. It is the positive counterpart of the noun 遺憾, meaning performance or expression is so complete that nothing was left undone.

Examples

1. 彼は長年の研究成果をこの論文で遺憾なく発揮した。 He fully demonstrated the results of his years of research in this paper.
2. 舞台上で彼女は自らの才能を遺憾なく披露した。 On stage, she showcased her talent to the fullest.
3. チームは持てる力を遺憾なく出し切り、悔いのない試合をした。 The team gave everything they had without reserve and played a game with no regrets.

Usage Guide

Context: achievements, performance, speeches, formal writing

Tone: admiring

Origin & History

Formed from 遺憾 (regret, shortcoming) + なく (without). The logic: if regret means 'something left undone,' then 遺憾なく means 'with nothing left undone' — fully and completely.

Cultural Context

Era: Modern

Generation: Adult

Social background: Educated