Fixedness is a related term of steadfastness.
As nouns the difference between fixedness and steadfastness
is that fixedness is the state or condition of being fixed while steadfastness is loyalty in the face of trouble and difficulty.
fixedness
English
Noun
The state or condition of being fixed.
Synonyms
* fixity
* (dated) fixety
steadfastness
English
Noun
Loyalty in the face of trouble and difficulty.
Steadfast resolution.