Strong’s Greek
G2159 — eutonos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
εὐτόνως
eutonos — pronounced yoo-ton'-oce
adverb from a compound of 2095 and a derivative of teino (to stretch); in a well-strung manner, i.e. (figuratively) intensely (in a good sense, cogently; in a bad one, fiercely):--mightily, vehemently. see GREEK for 2095
2 occurrences in the KJV.
Luke 23:10
And the chief priests and scribes stood and vehemently accused him.
Acts 18:28
For he mightily convinced the Jews, and that publickly, shewing by the scriptures that Jesus was Christ.