adjective

1. suffering from disease or illness; unwell; ill: in this sense, now rare or literary in England
2. having nausea; vomiting or about to vomit: the predominant sense in England
3. characteristic of or accompanying sickness a sick expression
4. of or for sick people sick leave
5. deeply disturbed or distressed; extremely upset, as by grief, disappointment, disgust, failure, etc.
6. disgusted by reason of excess; annoyed or exasperated: usually with of sick of such excuses
   often sick and tired
7. in poor condition; impaired; unsound
8. having a great longing or nostalgia (for) sick for the hills
9. of sickly color; pale
10. having a discharge of the menses; menstruating
11. mentally ill or emotionally disturbed
12. Informal sadistic, morbid, or abnormally unwholesome a sick joke
13. ☆ Agric.
    1. incapable of producing an adequate yield of a certain crop wheatsick soil
    2. infested with harmful microorganisms a sick field

Etymology: ME sik, seke < OE seoc, akin to Ger siech < IE base *seug-, to be troubled or grieved > Arm hiucanim, (I) am weakening