From chophaph (in the moral sense of covered from soil); pure -- innocent.
see HEBREW chophaph
H2643. chaph
חַף adjective clean — only אָנֹכִ֑י חַף שָפשַׁע בְּלִי֫ אֲנִי זַךְ Job 33:9 I am pure, without transgression, I am clean (in speech of Elihu).