Greek word
eutónōs
εὐτόνως
What it means
in a well-strung manner, i.e. intensely (in a good sense, cogently
in a well-strung manner, i.e. (figuratively) intensely (in a good sense, cogently; in a bad one, fiercely)
Where it comes from
adverb from a compound of eû (εὖ) and a derivative of (to stretch)