It is not something analogous to playing the church organ, painting on vellum, discovering the North Pole (that insidious habit), looping the loop, being Astronomer Royal, and so on.

And rock dust had an insidious habit of permeating and clinging to objects well away from the actual excavation.

Para-voice is an insidious habit on tour.

It's the most insidious habit, an addiction.

For Mr. Munger, a very insidious habit is "to get so hooked by an idea that you ignore disconforming evidence."

That sort of thing is noble, but not as challenging as George Bernard Shaw's insidious habit of making his arch-villains equally noble as well as wise and practical.

Despite a rather cheeky title for what is essentially a profoundly melancholy memoir, "Assuming the Position" is an account of Whitaker's attempt "to come to terms with what is a more insidious habit and a more complicated psychological situation than I originally believed."