SEVERE

Rigorous — harsh (6)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 15,483 — 2019-12-21 00:00:31
  14A: Very strict (6)
• Quick crossword No 15,236 — 2019-03-08 00:00:29
  19D: Rigorous — harsh (6)