無頓着むとんちゃく I-adj Noun English jmdict 1 adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi) indifferent;unconcerned;nonchalant;unmindful;inattentive;careless 次郎は服のことに無頓着だ。 Jiro is indifferent about clothing.