That ye no longer walk (mhketi uma peripatein). Infinitive (present active) in indirect command (not indirect assertion) with accusative uma of general reference. In vanity of their mind (en mataiothti tou noo autwn). "In emptiness (from mataio, late and rare word. See Romans 8:20 ) of their intellect (noo, late form for earlier genitive nou, from nou).