ποιμένιος
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (LSJ)
α, ον, rare synonym of ποιμενικός, κάματοι, δόναξ, AP 6.73 (Maced.), APl.4.226 (Alc.).
German (Pape)
[Seite 651] seltnere poet. Form statt ποιμενικός; Col. 109; νάπαι, Ep. ad. 647 (VII, 717); δόναξ, Alc. 12 (Plan. 226); Jac. A. P. p. 866.