むとんちゃく 無頓着 LinksSentence search for 無頓着Sentence search for むとんちゃくSentence search for むとんじゃくKanji details for 無, 頓 and 着Edit in JMdict Na-adjective (keiyodoshi), Noun1. indifferent; unconcerned; nonchalant; unmindful; inattentive; carelessOther forms無頓着 【むとんじゃく】 Discussions Log in to talk about this word.