ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
unsuitable: P. ἀνεπιτήδειος, P. and V. ἀσύμφορος.
unpleasant: P. and V. βαρύς, ἐπίφθονος, P. ἀηδής.
