ἐκπληκτ-ικός · ekplēkt-ikos — LSJ
striking with consternation, astounding, θόρυβος Th. 8.92; ἐ. τοῖς ἐχθροῖς X. Eq.Mag. 8.18 (Comp.); ἐκπληκτικώτερον more surprising or startling, Arist. Po. 1460b25: Sup., Plb. 3.4.5, Onos. 22.4.
Adv. -κῶς terribly, D.S. 14.25 : Sup. -ώτατα Ael. NA 11.32.
with enthusiasm, ἀποδέξασθαί τινα Plb. 10.5.2.