The quality of being steady, or not changing or moving.
Steadinesses is usually a good thing because it means something is reliable and not likely to change.
Examples:
Her steadinesses helped her walk on the narrow path.
The steadinesses of the old bridge made it safe to cross.
The cat's steadinesses made it a good hunter.
The tree's steadinesses made it a good place to build a nest.
The mountain's steadinesses made it a good place to build a house.
The boat's steadinesses made it a good place to fish from.