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
θερμόβουλος, ἔνθερμος, διάπυρος, ἰσχυρός, πυρίφλεκτος, πυρίπνοος, πυρίπνους, ζάπυρος, πυρόεις, φλεγυρός, δριμύς, θαλυκρός, ζαφλεγής, αἴθοψ, αἴθων, ονος, θερμός, ἔμπυρος, νεανικός