insidious
adjective
1. beguiling but harmful
- insidious pleasures
Similar word(s): seductive
2. intended to entrap
Similar word(s): dangerous, unsafe
3. working or spreading in a hidden and usually injurious way
- glaucoma is an insidious disease
Similar word(s): harmful, pernicious, subtle
Sentences with insidious as an adjective:
- Hansel and Gretel were lured by the witch’s insidious gingerbread house.
- The battle was lost due to the actions of insidious defectors.