chronic

definition: 
(Of an illness) persisting for a long time or constantly recurring
sentence: 
People with chronic respiratory or cardiovascular illness or immune system diseases are also more susceptible than others to pollutants.
difficulty: 
very easy
toefl frequency: 
3
toefl classification: 
adverb: 
chronically
adjective: 
chronic
adverb sentence: 
adjective sentence: 
Meanwhile India is stuck in heavy industries, such as steel, that are chronically oversupplied.
Today, many economists suspect this rate is permanently lower as a result of chronically weak demand and low productivity growth
verb: 
verb sentence: 
noun: 
noun sentence: