This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. the state of being steady

n. the degree of stability

n. The quality or state of being steady.

n. Steady character, quality, or condition.

n. freedom from wavering or indecision; constancy of resolve or conduct

n. the quality of being steady--regular and unvarying

n. the quality of being steady or securely and immovably fixed in place

"It is possible, that I may be more unhappy from the due observation of the good doctor's general precept, than were I to yield the point; since what I call steadiness is deemed stubbornness, obstinacy, prepossession, by those who have a right to put what interpretation they please upon my conduct."

unsteadiness   

resolve    firmness    resolution    resoluteness    firmness of purpose    regularity   

resolution    constancy    unchangeableness   

firmness    constancy    calmness    self-control    coolness    steadfastness    tenacity    sobriety    intrepidity    tact