in·sid·i·ous
/inˈsidēəs/
adjective
proceeding in a gradual, subtle way, but with harmful effects.
"sexually transmitted diseases can be insidious and sometimes without symptoms"
synonyms: stealthy, subtle, surreptitious, sneaking, cunning, crafty, Machiavellian, artful, guileful, sly, wily, tricky, slick, deceitful, deceptive, dishonest, underhand, backhanded, indirect, sneaky
Insidious
Film franchise
Insidious is an American horror franchise created by Leigh Whannell and James Wan that is produced by Blumhouse in association with Sony’s Stage 6 Films. The films in the franchise include Insidious, Chapter 2, Chapter 3, The Last Key, and The Red... Wikipedia
Characters: Lipstick-Face Demon, Old Woman, Elise Rainier, and more
Production companies: Blumhouse Productions, Sony Pictures, Stage 6 Films, and more
Directors: Patrick Wilson, Leigh Whannell, Adam Robitel, and more
Based on: Characters created; by Leigh Whannell
Box office: $731.9 million; (5 films)
Movies
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The meaning of INSIDIOUS is having a gradual and cumulative effect : subtle. How to use insidious in a sentence. insidious, sinister, or pernicious?