The best replacement for sick is ill.

The best alternatives to sick are rated as following:
★★★★★  ill
★★★★★  allergies
★★  not sick
★★  pregnant
★  teething
★  morning sickness
★  depressed
★  hungry
★  sic
★  food poisoning
  is it allergies
  when women are sick
  healthy
  sicker
  last rites
  man sick
  hungover
  women sick
  men sick
  call out sick
  pto

Your alternative for sick is not listed? Suggest!
Speaking about sick, one probably shouldn't forget about diarrhea.

Other search terms related to sick and their ratings are:
★★★★★ diarrhea
★★ doctor's note
★ sore throat
★ mc
You have in mind a companion for sick and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sick in all years. Click on graph for more.
sick
ill
allergies