SPECIOUS

Plausible but false (8)

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

• Quick crossword No 15,852 — 2021-02-26 00:00:00
  12D: Convincing at first, but flawed (8)
• Quick crossword No 15,576 — 2020-04-08 23:00:29
  13D: Deceptively pleasing (8)
• Quick crossword No 15,457 — 2019-11-21 00:00:40
  20A: Plausible but false (8)