ῥευστός
From LSJ
εἰ γάρ κεν καὶ σμικρὸν ἐπὶ σμικρῷ καταθεῖο καὶ θαμὰ τοῦτ᾽ ἔρδοις, τάχα κεν μέγα καὶ τὸ γένοιτο → for if you add only a little to a little and do this often, soon that little will become great (Hesiod W&D, 361-362)
English (LSJ)
ή, όν,
A in a state of flux, flowing, ἔργα Emp.121.3; ἡ ὕλη Arist.Fr.207, S.E.P.1.217, Porph.Antr.5; of time flowing away, Ath.Mech.3.10. 2 metaph., fluctuating, unsettled, οὐσία Plu.2.268d; ὀλισθηρὰν καὶ ῥ. εἰς ἅπαντα τὴν πολυπραγμοσύνην ποιοῦντες ib.522a.
German (Pape)
[Seite 838] geflossen, flüssig, übh. nicht fest, dah. übtr. = in steter Bewegung, schwankend, unbeständig, fluxus; ὀλισθηρὰν καὶ ῥευστὴν εἰς ἅπαντα τὴν πολυπραγμοσύνην ποιεῖν, Plut. de curios. 13; καὶ μεταβλητά, Adv. Colot. 16, öfter; ὕλη, S. Emp. pyrrh. 1, 217.