Firmness, n.
The state or quality of being firm.
Syn. -- Firmness, Constancy. Firmness belongs to the will, and constancy to the affections and principles; the former prevents us from yielding, and the latter from fluctuating. Without firmness a man has no character; "without constancy," says Addison, "there is neither love, friendship, nor virtue in the world."
Shades of meaning
Fernald lists firmness only as an antonym, under change.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given