ailing
adj1
Sickly; sick; ill; unwell.
- She cared for her ailing brother day in, day out.
- Based on the successful Class 59 but with a much more modern engine, what was to become the Class 66 was designed to replace much of the company's elderly and ailing locomotive fleet.2021 February 24, “Fleet News: Class 66 history”, in RAIL, number 925, page 27: