surreptitiousness

Sarrion rode up to the gate and rang a bell, which clanged with a sort of surreptitiousness just within.

There had been in her movement a sort of perfection of surreptitiousness that was animal.

And, indeed, the quiet of the streets had a suggestion of surreptitiousness.

I instantly told all to Stanton, who was almost ignorant of Franklin's surreptitiousness.