beguiling but harmful; "insidious pleasures"; intended to entrap; working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"

Frequently asked questions for insidious:

How many solutions are there for the crossword clue "INSIDIOUS"?

There are 136 solutions. The longest is UNSTRAIGHTFORWARD with 17 letters, and the shortest is SLY with 3 letters.

How can I find the solution for "INSIDIOUS"?

Use our smart search feature to filter by word length. Our system organizes results by frequency and relevance. Search through millions of answers to thousands of crossword clues—for free!

Is crossword puzzle clue "INSIDIOUS" trending today?

Indeed, the puzzle clue "INSIDIOUS" has seen a surge in lookups recently (last checked: 21 Dec 2025). Apparently it´s giving players some headaches!

How long are the solutions for "INSIDIOUS"?

Solutions are between 3 and 17 letters long.

Still in puzzle mode? Solve these clues related to ‘INSIDIOUS’

Clue	Answers

Destroys insidiously	1
Insidious computer program	1
Insidious insider	1
Insidious malware with a classically derived name	1
Insidious snare	1
Insidious sort	1
Weaken insidiously	1

‘INSIDIOUS’ isn’t just a clue – it’s also a popular crossword answer! Check out these clues where ‘INSIDIOUS’ is the solution:

Clue	Answer

Stealthily treacherous (9)	insidious