noun
1.
Synonyms: stability , security, soundness, stableness, steadiness, strength
2.
Synonyms: decision 2, decidedness, determination, purposefulness, purposiveness, resoluteness, resolution, resolve
FIRMNESS
Meaning of FIRMNESS in English
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003