Adverb · From a compound of εὖ (G2095) and a derivative of teino (to stretch)
Adverb from a compound of G2095 and a derivative of τείνω teínō (to stretch); in a well-strung manner, i.e. (figuratively) intensely (in a good sense, cogently; in a bad one, fiercely):—mightily, vehemently.
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Strongs concordance