Strong’s Greek
G1113 — goggustes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
γογγύστης
goggustes — pronounced gong-goos-tace'
from 1111; a grumbler:--murmurer. see GREEK for 1111
1 occurrence in the KJV.
Jude 1:16
These are murmurers, complainers, walking after their own lusts; and their mouth speaketh great swelling words, having men’s persons in admiration because of advantage.