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Pronunciation varies by accent · noun
A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious..
This lent a new insidiousness to his temptation, since her contempt would be a refuge from his own.
Use insidiousness when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Insidiousness means A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
This lent a new insidiousness to his temptation, since her contempt would be a refuge from his own.
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