Insidious

usgb/ɪnˈsɪdiəs/Volume
Left Definition 1 of 2Right
LampPro Tip 1/3
Hidden HarmPlay
Use 'insidious' for problems that worsen without obvious symptoms. SlideThe spy's insidious sabotage went unnoticed until it was too late.
LampPro Tip 2/3
Slow ProgressionPlay
Describes something harmful developing gradually, which may be difficult to detect initially. SlideClimate change is an insidious threat that evolves over decades.
LampPro Tip 3/3
Cultural NuancePlay
'Insidious' is often used to describe sly tactics or conspiracies in movies and literature. SlideThe insidious plot of the villain in the novel kept readers on edge.