無頓着, むとんちゃく, むとんじゃく
NA-adjective
indifferent, unconcerned, nonchalant, unmindful, inattentive, careless
次郎は服のことに無頓着だ。
だ
copula, See である, See です, plain copula
1. be, is
Auxiliary verb, See た・1, た after certain verb forms; indicates past or completed action
2. did, (have) done
See た・2, indicates light imperative
3. please, do