φίλτατος
From LSJ
Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either
English (LSJ)
η, ον, irreg. Sup. of φίλος, mostly poet., Il.6.91, al., Pi.P.9.98, A.Th.16, Ar.Ach.885, etc.; τὰ φ.
A one's nearest and dearest, v. φίλος 1.1c; οἱ φ. A.Ch.234; less freq. in Prose, Pl.Prt.314a, Grg.513a, Lg.650a, X.Cyr.4.3.2, etc.; τὰ φ. σώματα, opp. τοὺς ἀλλοτρίους, Aeschin.3.78; cf. φίντατος.