プログレッシブ和英中辞典(第4版)の解説
みれん【未練】
〔心残り〕regret；〔愛着〕attachment ((to a person, to a thing))，lingering affection ((for a person))
未練があったが申し出を断った
I turned down the offer with (much) regret.
今会社をやめるのは未練が残る
I feel reluctant to leave the company now.
もう彼に未練はない
I'm no longer interested in him.／I don't care for him any longer.／《口》 I've gotten over him completely.
あんなはした金に未練はない
Losing such a paltry sum of money doesn't bother me at all.