Njaee det verkar ha en ganska bred betydelse, iaf enligt Oxford:
ailing
/ˈeɪlɪŋ/
adjective
in poor health.
"I went to see my ailing mother"
Liknande:
ill, unwell, not well, sick, sickly, poorly, weak, indisposed, in poor/bad health, infirm, debilitated, delicate, off colour
Edit: Kul fakta...