Provideth not for his own (tōn idiōn ou pronoei). Condition of first class with ei and present active (or middle pronoeitai) indicative of pronoeō, old verb, to think beforehand. Pauline word in N.T. only here, 2Co 8:21; Rom 12:7. With genitive case.
He hath denied the faith (tēn pistin ērnētai). Perfect middle indicative of old verb arneomai. His act of impiety belies (Tit 1:16) his claim to the faith (Rev 2:13).
Worse than an unbeliever (apistou cheirōn). Ablative case of apistou after the comparative cheirōn. Who makes no profession of piety.