sickness in WordNet English dictionary

1. impairment of normal physiological function affecting part or all of an organism
   illness  unwellness  malady  sickness 
   
2. the state that precedes vomiting
   nausea  sickness 
   
3. defectiveness or unsoundness
   "drugs have become a sickness they cannot cure"; "a great sickness of his judgment"
   sickness