SOLID

Substantial (5)

Solution has appeared in 3 crosswords (1 across and 2 down):

• Quick crossword No 15,866 — 2021-03-15 00:00:45
  20A: Sturdy (5)
• Quick crossword No 15,820 — 2021-01-20 00:00:05
  5D: Like a rock (5)
• Quick crossword No 15,399 — 2019-09-13 23:00:42
  20D: Substantial (5)