Extended Strong's Greek Lexicon (Abbott-Smith based)
to deprave
Usage: κατα-φθείρω [in LXX chiefly for שָׁחַת hi., Gen.6:12, al. ;] __1 1 to destroy entirely. __2. In moral sense (as LXX), to deprave, corrupt: pass. pf. ptcp., before τ. νο ν, 2Ti.3:8.† (AS)