ἀργιλλώδης
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
or ἀργῑλώδης, ες,
A clayey, ἀργιλωδεστέρην γῆν Hdt.2.12, cf. Arist.Mete.352b10, Thphr.HP3.18.5, Antyll. ap. Orib.9.11.4; ὄχθαι Euph.11 (=Archyt.Amph.2).