σφαλερὰ πρὸς ὑγίειαν ἕξις

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

Source

Dutch (Woordenboekgrieks.nl)

gevaarlijk voor de gezondheid

Russian (Dvoretsky)

шаткое здоровье