στερεός, -ά, -όν
[in LXX: Num.8:4 (מִקְשָׁה); σ. πέτρα, Isa.5:28 (צַר), etc. ;]
hard, firm, solid: τροψή, Heb.5:12, 14; θεμέλιος, figuratively, 2Ti.2:19. Metaphorical,
__(a) in bad sense, hard, cruel (Hom., al.);
__(b) in good sense, steadfast, firm: τ. πίστει, 1Pe.5:9.†
(AS)