πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
ἀνήνεμος, νήνεμος, νηκηδής, ἀθορύβητος, ἄπονος, ἄτρομος, ὑπερβόρεος, σχολαῖος, λιπαρός, μαλακός, ἀπερίσπαστος, ἀταλάφρων, ἀπερίστατος, ἄμοχθος, ἀπήμαντος, ἀσινής, ἀσάλευτος, φανός, ἀβληχρός, γαληνός, ἕκηλος, ἕκαλος, εὔκηλος, εὔκαλος, λεῖος