Strong’s Greek
G5572 — pseudodidaskalos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ψευδοδιδάσκαλος
pseudodidaskalos — pronounced psyoo-dod-id-as'-kal-os
from 5571 and 1320; a spurious teacher, i.e. propagator of erroneous Christian doctrine:--false teacher. see GREEK for 5571 see GREEK for 1320
1 occurrence in the KJV.
2 Peter 2:1
But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.