CHRONIC

(Of an illness) long-lasting (7)

Solution has appeared in 2 crosswords (0 across and 2 down):

• Quick crossword No 16,521 — 2023-04-18 23:00:22
  2D: Very serious (informal) (7)
• Quick crossword No 15,574 — 2020-04-06 23:00:09
  1D: (Of an illness) long-lasting (7)