LSJ
ές, = εὐάκεστος, εὐακέστερόν [ἐστι] Ruf. (?) ap. Orib inc. 4.54. Ion. Adv. εὐακέως by an easy process of healing, Aret. CA 2.2.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ές, leicht zu heilen, Hesych.;
• adv. εὐακέως, Aret.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)