FIRMNESS

steadiness, firmness

(noun) the quality of being steady or securely and immovably fixed in place

resoluteness, firmness, firmness of purpose, resolve, resolution

(noun) the trait of being resolute; “his resoluteness carried him through the battle”; “it was his unshakeable resolution to finish the work”

firmness

(noun) the property of being unyielding to the touch

firmness, soundness

(noun) the muscle tone of healthy tissue; “his muscular firmness”

Source: WordNet® 3.1

Etymology

Noun

firmness (countable and uncountable, plural firmnesses)

The state of being firm; strength; permanence; stability; hardness; resolution.

Source: Wiktionary

Firm"ness, n.

Definition: 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."

Source: Webster’s Unabridged Dictionary 1913 Edition