insidiousness

• Качество быть коварным, скрыто опасным, вероломным или оказывающим постепенное, накапливающееся разрушительное воздействие; часто используется в контексте болезней или обмана.

A noun referring to the quality of being subtly harmful, treacherous, or having a gradual, cumulative damaging effect, often used in contexts such as disease or deception.

uncountable

1. Subtle and cumulative harmfulnessC2formalmedical

   The quality of being harmful in a gradual, subtle, and often unnoticed way, especially regarding a disease or condition.

   Коварство

   • The insidiousness of the virus made it difficult to detect until it was too late.
   • Doctors warned about the insidiousness of high blood pressure, which often shows no early symptoms.
   • The insidiousness of the disease lies in its ability to damage organs silently over many years.

   Synonymsperniciousness

2. Quality of being designed to entrapC2formal

   The quality of being cunning, treacherous, or intended to deceive and trap someone.

   Коварство

   • The insidiousness of the scam was revealed only after many victims had lost their savings.
   • He was unaware of the insidiousness of the plan, which was designed to ruin his reputation.
   • The insidiousness of the propaganda lay in its subtle manipulation of public opinion.

   Synonymsartfulnesscraftinesscunningdeceitfulnessdeviousnessduplicityguileslynesstreacherywiliness