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Insidiousness (Noun)

Subtle and cumulative harmfulness (especially of a disease).

Nouns denoting attributes of people and objects.

The insidiousness of the disease was such that the patient didn't even realize they were ill until it was too late.
Years of exposure to the toxic chemical had an insidiousness that caused irreversible damage to the workers' health.
The insidiousness of the virus was evident in the way it slowly weakened the immune system over time.
The doctor warned her patients about the insidiousness of high blood pressure, which could lead to serious complications if left untreated.
The insidiousness of the allergen was such that it caused a gradual decline in the patient's respiratory health over several months.

The quality of being designed to entrap.

Nouns denoting attributes of people and objects.

The pyramid scheme's insidiousness was revealed when it was discovered that the returns promised to investors were unsustainable and reliant on recruiting new victims.
The cult's leader used insidiousness to lure in vulnerable individuals by promising them a sense of belonging and acceptance, only to exploit them financially and emotionally.
The advertisement's insidiousness was in its use of subtle psychological manipulation to make the viewer feel inadequate without the product being promoted.
The loan's insidiousness lay in its complex terms and conditions that hid exorbitant interest rates and fees, designed to keep borrowers in debt indefinitely.
The company's insidiousness was exposed when it was revealed that they had been collecting and selling users' personal data without their knowledge or consent.