ἔχιδνα
From LSJ
ἀκίνδυνοι δ' ἀρεταὶ οὔτε παρ' ἀνδράσιν οὔτ' ἐν ναυσὶ κοίλαις τίμιαι → but excellence without danger is honored neither among men nor in hollow ships
English (LSJ)
ἡ, (ἔχις)
A viper, Hdt.3.108, S.Tr.771, Pl.Smp.218a, etc.; prob. of a constrictor snake, Act.Ap.28.3: metaph., of a treacherous wife or friend, A.Ch.249, S.Ant.531; ἱματισμένη ἔ., of woman, Secund.Sent.8; γεννήματα ἐχιδνῶν brood of vipers, term of reproach, in Ev.Matt.3.7. II pr. n. of a monster, Hes.Th.297, S.Tr. 1099.