[εὐτόνως] adverb from a compound of G2095 and a derivative of τείνω (to stretch); in a well-strung manner, i.e. (figuratively) intensely (in a good sense, cogently; in a bad one, fiercely)
Usages throughout the bible
Luke 23:10
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And the chief priests and scribes stood and vehemently G2159 accused him.
Acts 18:28
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For he mightily G2159 convinced the Jews, and that publickly, shewing by the scriptures that Jesus was Christ.