Chronic – English Flashcard for Chronic with Synonyms Updated: June 30, 2019 by Dr. Mohammad Hossein Hariri AslChronicChronic (adj) /ˈkrɒn.ɪk/ US /ˈkrɑː.nɪk/(of a disease) lasting for a long time – long-lasting – enduring – always present – persistent – habitual – extremely bad:He’s suffering from chronic fatigue.