ἀκύμ-αντος · akym-antos — LSJ
not washed by waves, ψαμάθοις ἐπʼ ἀκυμάντοις on sands washed by no waves, i.e. those of the stadium, E. Hipp. 235, cf. 229; πλοῦς Them. Or. 18.221b (Comp.); προσοχὴ σκάφους Iamb. VP 3.16.
waveless, calm, πέλαγος Luc. DMar. 5.1; θάλαττα Max.Tyr. 31.5.
Act., not raising waves, ἐρετμοί, αὖραι, Nonn. D. 2.14, 3.36.