いかんせんばん 遺憾千万 LinksSentence search for 遺憾千万Sentence search for いかんせんばんKanji details for 遺, 憾, 千 and 万Edit in JMdict Na-adjective (keiyodoshi)1. highly regrettable; utterly deplorableYojijukugo (four character compound) Discussions Log in to talk about this word.