Synonyms for Perseverance:
Formal:
* Tenacity
* Persistence
* Assiduity
* Diligence
* Steadfastness
* Indefatigability
* Resolute
* Unwavering
* Doggedness
* Grit
* Fortitude
* Resilience
* Determination
Informal:
* Stick-to-it-iveness
* Never-say-die attitude
* Staying power
* Gumption
* Backbone
Antonyms for Perseverance:
Formal:
* Quitting
* Abandonment
* Despair
* Giving up
* Resignation
* Apathy
* Indifference
* Laziness
* Procrastination
Informal:
* Giving in
* Backing down
* Throwing in the towel
* Caving in
* Letting it go
It's important to note that the best synonym or antonym will depend on the context in which the word "perseverance" is used.