chronic
Pronunciation: /ˈkrɒnɪk/
adjective
- 1(of an illness) persisting for a long time or constantly recurring: chronic bronchitisOften contrasted with acute.
- (of a person) having a chronic illness: a chronic asthmatic
- (of a problem) long-lasting: the school suffers from chronic overcrowding
- (of a person) having a bad habit: a chronic liar

Origin:
late Middle English: from French chronique, via Latin from Greek khronikos 'of time', from khronos 'time'