Insidious
/ɪnˈsɪd.i.əs/noun
Proceeding in a gradual, subtle way but with harmful effects.
Did you know?In ancient Rome, 'insidiae' referred to ambushes and traps, linking the term to deception and danger, embodying a hidden threat.
Etymological Timeline
Latin
Latin
insidiae
“Ambush, trap, or a position to lie in wait.”
Medieval Latin
Medieval Latin
insidiosus
“Full of traps or deceitful.”
16th Century
English
insidious
“Characterized by stealthy treachery or deceit.”
Modern English
English
insidious
“Gradual and harmful; treacherous.”