いかん 遺憾 Common word Wanikani level 55 Show 1 collocation 遺憾に堪えない - really regrettable LinksSentence search for 遺憾Sentence search for いかんKanji details for 遺 and 憾Edit in JMdict Na-adjective (keiyodoshi), Noun1. regrettable; unsatisfactory; deplorable; lamentable Discussions Log in to talk about this word.