εὐάερος
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, with fresh, good air, τὸ εὐ. Str.3.2.13, cf. Herod.Med. in Rh.Mus.58.73, Orib.9.20.1.
Greek (Liddell-Scott)
εὐάερος: -ον, (ἀήρ) ἔχων καλόν, δροσερὸν ἀέρα, Στράβ. 150.