1. Ailing: Mildly unwell.
2. Infirm: Weak or physically feeble.
3. Frail: Delicate and easily weakened.
4. Convalescent: Recovering from illness.
5. Indisposed: Slightly unwell.
6. Debilitated: Weakened by illness.
7. Bedridden: Confined to bed due to illness.
8. ailing: Suffering from an illness.
9. ailing: Not feeling well.
10. ailing: Having a disease or disorder.