Strong’s Greek
G2704 — katphtheiro
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
καταφθείρω
katphtheiro — pronounced kat-af-thi'-ro
from 2596 and 5351; to spoil entirely, i.e. (literally) to destroy; or (figuratively) to deprave; --corrupt, utterly perish. see GREEK for 2596 see GREEK for 5351
2 occurrences in the KJV.
2 Timothy 3:8
Now as Jannes and Jambres withstood Moses, so do these also resist the truth: men of corrupt minds, reprobate concerning the faith.
2 Peter 2:12
But these, as natural brute beasts, made to be taken and destroyed, speak evil of the things that they understand not; and shall utterly perish in their own corruption;