ἀδιαφορέω
From LSJ
ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → life is not worth living if you do not have at least one friend
English (LSJ)
A to be indifferent, κατά τι S.E.P.1.191; πρός τι M.Ant.11.16; ἀδιαφορεῖ impers., ἐάν . . ἐάν . . Ph.2.243: c. inf., A.D.Pron.45.22. 2 Gramm., not to agree, in case, gender, etc., ib.68.15,al. II ἀ. τινός not to differ from, Ph.1.414. III personal, bring about no change, Gal.1.194. IV Math., to be negligible, Procl.Hyp. 3.31; ἀ. πρὸς ἄσθησιν not to differ appreciably, ib.3.15. V of persons, to be neglected, uncared for, PLond.2.144 (i A.D.).