wearisome
From LSJ
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
adj.
P. and V. βαρύς, ὀχληρός, λυπηρός, δυσχερής, Ar. and P. χαλεπός, ἐπίπονος, Ar. καματηρός; see troublesome, laborious.