G2551 — kakologeo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
kakologeo — pronounced kak-ol-og-eh'-o
from a compound of 2556 and 3056; to revile:--curse, speak evil of. see GREEK for 2556 see GREEK for 3056
4 occurrences in the KJV.
Matthew 15:4
For God commanded, saying, Honour thy father and mother: and, He that curseth father or mother, let him die the death.
Mark 7:10
For Moses said, Honour thy father and thy mother; and, Whoso curseth father or mother, let him die the death:
Mark 9:39
But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me.
Acts 19:9
But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.