Strong's G2159 — εὐτόνως (adverb)
eutonos (yoo-ton'-oce) adv.
1. in a well-strung manner, vigorously
2. (figuratively, good) cogently
3. (figuratively, bad) fiercely
[adverb from a compound of G2095 and a derivative of teino "to stretch"]
KJV: mightily, vehemently 
Root(s): G2095 
Hebrew root: εὖ
Occurrences: 2