εὐθενία
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)
ἡ, = εὐθένεια ΙΙ (q.v.), from which it cannot be distinguished after ii B.C.: Ion. εὐθενίη () Epigr. in Rev.Phil.19.178 (i B.C.), Epigr.Gr.1036.19 (Nicomedia); εὐθενία is v.l. in Arist. Rh.1360b16, HA602a15 (v.l. εὐσθένεια, εὐθένεια), Porph. Gaur.16.2.—From ii A.D. εὐθένεια and εὐθενία begin to be confused with εὐθηνία.