"wiliness" is a correct and usable word in written English.
It is a noun that means "the quality of being cunning or sly". For example, "His wiliness in the negotiations enabled him to get the best outcome for his client."
Mr. Trillin likes to call Mr. Navasky "wily and parsimonious," and in his book Mr. Navasky gets some of that wiliness onto the page.
Of serving politicians, perhaps only George Osborne, the chancellor of the exchequer, and Alex Salmond, Scotland's first minister, rival him for sheer wiliness.
This former Belgian prime minister blends the austere demeanour of a monk (he famously writes Japanese haiku verses) with the wiliness of a French cardinal.
As Avinoam Idan, formerly an Israeli diplomat in Moscow, puts it, Hamas was looking for recognition; the Kremlin was looking for a chance to demonstrate its independence.And rather than the considered wiliness for which Mr Primakov was once renowned, the Hamas invitation announced by Mr Putin looks like evidence of a different trend: the Kremlin's tightening grip on policymaking.
The Americans, fed up at last with his wiliness and his human-rights abuses, began to part company with him in the late 1970s.
I love his craftiness, his wiliness, his moments of purest farce and tragedy.
They marvelled at the wiliness of wolves, laughed at the cleverness of apes, and asked each other, "Ifukwa?
He has grown strong by feeding on his own class resentment; wiliness is part of his DNA.
My father leapt off the boat as it touched shore, gun in hand, and made a long detour around the sandbar where the mugger lay, balancing its extreme wiliness against its cold-blooded craving for a hot sunbath.
Given the intensity — and the wiliness — of Fosca's various projections, it hardly matters who he is; she's interested only in her own narrative of betrayal and willfulness, and in getting Giorgio under her control.
The Qassam isn't exactly known for its efficacy, but the fact that Syrians were receiving Palestinian help indicates their wiliness, and their desperation to secure the means to fight back against the Syrian state's formidable Army and Air Force.
