慢性

slow and patient / chronic (disease) / slow to take effect (e.g. a slow poison)

slow

nature / character / property / quality / attribute / sexuality / sex / gender / suffix forming adjective from verb / suffix forming noun from adjective, corresponding to -ness or -ity / essence / CL:個|个[ge4]

chronic disease

slow-tempered / phlegmatic / a slowcoach

chronic pain

chronic illness / disease that takes effect slowly

chronic obstructive pulmonary disease (COPD)

chronic fatigue syndrome (CFS)