Strong's G1690 — ἐμβριμάομαι (verb)
embrimaomai (em-brim-ah'-om-ai) v.
1. to have indignation on
2. (transitively) to blame
3. (intransitively) to sigh with chagrin
4. (specially) to sternly enjoin
[from G1722 and brimaomai "to snort with anger"]
KJV: straitly charge, groan, murmur against 
Root(s): G1722 
Hebrew root: ἔν
Occurrences: 5