λιποδρανής
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)
ές, A lacking strength (cf. ἀδρανής), Aret.SD2.6.
Greek Monolingual
λιποδρανής, -ές (Α)
αυτός που έχει έλλειψη δυνάμεως, που δεν έχει δύναμη.
[ΕΤΥΜΟΛ. < λιπ(ο)- + -δρανής (< δραίνω «έχω δύναμη»), πρβλ. αδρανής, αμφιδρανής].