ετερόβουλος
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
Greek Monolingual
ἑτερόβουλος, -ον (Μ)
αυτός που έχει διαφορετική γνώμη.
[ΕΤΥΜΟΛ. < ετερο- + -βουλος (< βουλή)
πρβλ. εύ-βουλος, κακό-βουλος].