1. Ailing
2. Unwell
3. Infirm
4. Unfit
5. Ill
6. Unhealthy
7. Queasy
8. Queer
9. Faint
10. Debilitated
11. Frail
12. Unsound
13. Off
14. Diseased
15. Weak
16. Under the weather
17. Sickly
18. Unwholesome
19. Morbid
20. Contaminated
21. Infected
22. Sickening
23. Disordered
24. Unbalanced
25. Poorly
26. Pestilent
27. Contagious
28. Coughing
29. Sallow
30. Unwell

Finding synonyms for the word «sick» can be a challenge. Whether you are looking for a more formal term to use in a business context or a more casual term to use in everyday conversation, there are plenty of options to choose from. The best ideas for synonyms for «sick» include words like ailing, unwell, infirm, unfit, ill, unhealthy, queasy, queer, faint, and debilitated. Other words that could be used to describe someone who is sick include frail, unsound, off, diseased, weak, under the weather, sickly, unwholesome, morbid, contaminated, infected, sickening, disordered, unbalanced, poorly, pestilent, contagious, coughing, sallow, and unwell. With such a wide variety of words to choose from, you can be sure to find the perfect synonym for «sick» to fit any situation.