WordWeb Online

1. (medicine) being long-lasting and recurrent or characterized by long suffering
   "chronic indigestion"; "a chronic shortage of funds"; "a chronic invalid"
    
2. Persisting for a long time
   "chronic money problems";
   - continuing
    
3. Habitual
   "a chronic smoker";
   - inveterate
    
4. [Brit, informal] Very bad or serious
   "unemployment was chronic"

See also: degenerative, long, usual

Antonym: acute

Encyclopedia: Chronic