κλεπτίστατος
From LSJ
οἷς τὰ ὁρώμενα τὴν ἀρχὴν ἐνδίδωσι, καὶ οἷον ὑπήνεμα διὰ τῶν ὀφθαλμῶν τὰ πάθη ταῖς ψυχαῖς εἰστοξεύονται → who taketh his beginning and occasion from something which is seen, and then his passion, as though wind borne, shoots through the eyes and into the heart
English (LSJ)
η, ον, Att. Sup.formed from κλέπτης,
A the most arrant thief, Ar.Pl.27, Alciphr.3.20, Procop.Arc.21; κ. θεός S.E.P.3.215; κ. χεῖρες Adam. 2.20: also Comp. -ίστερος, α, ον, Suid. s.v. Νεοκλείδου.
German (Pape)
[Seite 1449] superl. wie von κλέπτης, der Diebischeste; Ar. Plut. 27; Eupolis bei Poll. 8, 34 (s. das Vor.); Ἑρμῆς S. Emp. pyrrh. 3, 215; χεῖρες Arist. physiogn. 2, 15.