Question: are chronic and persistent synonyms?
Answer: 1'a chronic illness' SYNONYMS. persistent, long-standing, long-term, constantly recurring. ... 
2'the chronic shortage of food' SYNONYMS. constant, continuing, continual, ceaseless, incessant, unabating, unending, persistent, perennial, long-lasting, lingering. ... 
3'a chronic liar' SYNONYMS. ... 
4'the film was absolutely chronic'