Strong's G197 — ἀκριβέστερον (adverb)
akribesteron (ak-ree-bes'-ter-on) adv.
1. (adverbially) more exactly
[neuter of the comparative superlative of akribes (a derivative of the same as G206)]
KJV: more perfect(-ly) 
Root(s): G206 
See also: G196, G198, G199 
Hebrew root: ἄκρον