Dictionary entry

καταφθείρω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

κατα-φθείρω,

[in LXX chiefly for שׁחת hi., Ge 6:12, al.;]

1 to destroy entirely.

2. In moral sense (as LXX), to deprave, corrupt: pass. pf. ptcp., seq. τ. νοῦν, II Ti 3:8.†