Bu çok sinsi bir hastalık. Çok geç olana kadar onu fark etmezsiniz.
- That's a very insidious disease. You don't notice it until it's too late.
Ne kadar sinsi bir varsayım.
- What an insidious assumption.
The battle was lost due to the actions of insidious defectors.
The nurse always must be alert to signs of slow leak or insidious infiltration.
Hansel and Gretel were lured by the witch's insidious gingerbread house.