We suspected not that deceit, insidiousness, and slavery were to be found beneath the sun.
Its insidiousness makes it exceedingly difficult to recognize.
As to his character: it is too bad to associate him with so much craft and insidiousness.
They believed in the personality, activity and insidiousness of the Devil.
The insidiousness of its design has been equalled only by the shameless manner of its being carried into execution.
She saw O-liver start from his chair and sink back, helpless against the insidiousness of this attack.
The constancy and the strength of temptation, and the insidiousness of the arguments it was supported by, has been proverbial.
Indeed, it is perhaps more damaging in its secondary effects because of its insidiousness.