Explanation:

- Persist means to continue firmly or obstinately in an action or course despite difficulty or opposition.

- Persevere (Option 1) means to continue in a course of action even in the face of difficulty. It’s similar to persist.

- Continue (Option 2) means to persist in an activity or process. It aligns with the idea of ongoing persistence.

- Insist (Option 3) involves demanding something forcefully, not exactly opposite of persist but related to steadfastness.

- Abandon (Option 4) means to give up completely, stop maintaining something. It's the opposite of persist.

- Option 4: Abandon is the antonym of persist.

- Endure (Option 5) means to suffer something painful or difficult patiently; it involves persistence.