Synonyms of 'fixity'
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the result of doggedness rather than talent
Perseverance is the quality of continuing with something even though it is difficult.
Perseverance will pay off in the end.
If you have persistence, you continue to do something even though it is difficult or other people are against it.
Skill comes only with practice, patience and persistence.
Thesaurus for fixity from the Collins English Thesaurus
If you talk about the fixity of something, you talk about the fact that it does not change or weaken .