As a Noun: 1. A health problem which makes you unable to work or live normally. English = illness, sickness, disease. 2. The experience of being ill for a period of time. English = illness. As a Verb or Adjective: 1. To be suffering from a disease or health problem which makes you unable to work or live normally. English = (be) sick, (be) ill. 2. To feel angry or disgusted by something. English = (be) sick. 3. To make someone feel angry or disgusted. English = (be) sick.