εὐχαριστικός

ή, όν, Adv.
A. of gratitude, ὕμνοι Ph. 2.109; εὐχή JHS 37.101 (Lydia, ii A.D.). Adv. -κῶς Ph. 1.59.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project