σταθερή

From LSJ

Τί κοινότατον; ἐλπίς. καὶ γὰρ οἷς ἄλλο μηδέν, αὕτη πάρεστι → What is most common? Hope. For those who have nothing else, that is always there.

Source

Russian (Dvoretsky)

στᾰθερή:
1 (sc. γῆ) твердая земля, суша Anth.;
2 (sc. θάλασσα) спокойное море, морская гладь Anth.