ἀξιοτέκμαρτος
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)
ον,
A worthy of being brought in evidence, credible, ἀξιοτεκμαρτότερον τοῦ λόγου τὸ ἔργον deeds are stronger proof than words, X.Mem.4.4.10.
German (Pape)
[Seite 270] einen treffenden Beweis gebend, im compar. Xen. Mem. 4, 4, 10.